Abstract: A mounting assembly for attaching an accessory to a dovetail rail interface on a firearm includes a body having a lower portion and an upper portion. The lower portion is configured to engage the dovetail rail interface and the upper portion is configured to receive and retain an accessory such as a scope or aiming device. A spring dampening structure resides within the body of the assembly wherein dampening structure is configured to dampen shock waves and harmonic vibration transferred into the body from operation of the firearm. A clamping assembly is configured to releasably clamp the body to the dovetail rail interface.

Abstract: A rail mounting mechanism for coupling an auxiliary device to a weapon has an eccentric hub and a blade with a lever arm that can be used to overcome tolerances in mounting rails to provide a consistent grasp of the rail.

Abstract: A weapon accessory mounting system for mounting an accessory, such as a light or laser sight, directly to the front sight base of a host weapon without requiring modification of the weapon. The system includes a bracket with a clamp member and a plank member. The clamp member has a generally C-shaped cross-section defined by a base portion disposed between two clamp arms. The C-shaped cross-section defines a channel extending along a sight base axis. The plank member has a rail portion for slidably mounting a weapon accessory, and at least one accessory engagement slot for latchable engagement by the accessory. The aim axis is generally perpendicular to the sight base axis. The system typically includes two detent elements disposed in the base portion for actuatable protrusion of a portion of the detent elements into the channel for providing a clamping force and adjustment of the rail pitch angle.

Abstract: A U-shaped mounting bracket is affixed around a rear iron sight housing. The mounting bracket includes a first and second bracket side that perpendicularly extend from the top bracket side. The first and second bracket sides are secured to the rear iron sight housing of a firearm by a hinge pin driven into the hinge pin holes in the mounting bracket and the rear iron sight housing. Bracket sides extend the top bracket side above the rear sight iron. Fasteners brace the bracket sides securely against the external surface of the rear iron sight housing. The top bracket side can receive a scope rail or the forward mount may have an integrated rail unit. The top bracket side has leveling set to align the attached scope or other sighting device with the axis on the bore of the firearm.

Abstract: A sighting assembly for a firearm includes a scope and a mounting clamp. The mounting clamp includes a ring cap and a ring base that cooperate to surround and hold the scope. The ring cap and ring base securely grip the scope without damaging the scope. Clamping forces are generally tangent to the scope to minimize or limit the formation of dents, grooves, or other types of marring and/or damage to optics or the body of the scope.

Abstract: An electronic device mounting system can be used to attach electronic devices, such as rangefinders and video cameras, to weapons. The mounting system includes a support portion for resiliently supporting the electronic device and a mounting portion for attaching the support portion and attached electronic device to a weapon. The support portion is universal in that it can be used with a number of interchangeable mounting portions. Each mounting portion is adapted for securing the support portion to a particular type of weapon or weapon accessory.

Abstract: A detachable rail platform adaptable for selective and secure mounting to a weapon's rear iron sight assembly, the rear iron sight assembly having a sight base and a sight guard. The detachable rail platform includes a body having forward and rearward portions. The body further includes a rail portion and is positionable to envelop the rear iron sight assembly. A first clamp assembly is selectively engageable with the sight base at a predetermined position. A second clamp assembly is selectively engageable with the sight guard. Upon engagement of the first and second clamp assemblies to the sight base and the sight guard respectively, the rail platform is selectively and securely mounted to the weapon.

Abstract: An accessory module is installed between a weapon accessory (optical sighting device) and its corresponding mounting interface. The accessory module includes a body having a lower surface which is configured and arranged to mate with the corresponding upper surface of the mounting interface and an upper surface that includes a seat that is configured and arranged to conform to and receive the outer surface of the weapon accessory. The accessory module includes electronic accessories, such as for example, a flashlight configured to emit visible white light, colored light and/or infrared light. Further, the accessory module may include laser devices therein such as a laser sight, an infrared laser for night vision targeting, or a laser range finder device. The accessory module may also be configured to include a taser and/or a compact video camera.

Abstract: A rifle scope alignment device includes a telescopic sight and a mount to position and align a crosshair reticule in a repeatable manner. The device includes a mounting rail, a pair of clamping brackets, and a scope. The mounting rail is coupled to a barrel of a firearm, preferably a rifle, and provides attachment of the clamping brackets. At least one lower clamping bracket has a spring-loaded ball bearing designed to engage a corresponding slot machined into an exterior of the scope. This interaction establishes an accurate and repeatable alignment of the scope and an internal crosshair reticule.

Abstract: An adapter for mounting on a weapon. The adapter illustratively includes a plurality of mounting rails for removably coupling with a variety of accessories, such as sights, illumination devices, and laser aiming devices.

Abstract: A universal accessory mount for a heavy machine gun includes an annular base adapted to be disposed concentrically over a front end of a shroud of the gun and having diametrically opposing upper and lower accessory mounting tines extending forwardly therefrom. A holding mechanism pulls a planar floor of a counterbore in the rear of the base into contact with a planar front surface of the shroud of the gun. The holding mechanism includes a pair of threaded bolts extending rearwardly from the base through respective ones of a pair of diametrically opposing bolt apertures contained in the base, and a pair of cleats, each having an opening into which a rear end portion of a respective one of the bolts is received and a respective hook adapted to grip the shroud of the gun through a respective hole in the shroud.

Abstract: The Low Reflectivity Contact has a low coefficient of light reflection, is rugged with respect to harsh ambient environmental conditions, provides a low resistance electrical connection, and is adapted for use in quick-connect applications. Light reflectivity of the contact is minimized by the use of a conductive mesh that is used to implement the electrical contact. The weave density and wire diameter of the conductive mesh maximizes the attenuation of reflected light in the visible spectrum, yet maintains high electrical conductivity and a lack of sensitivity to contamination via the choice of materials used to implement the Low Reflectivity Contact.

Abstract: A coupler apparatus for releasably securing an object to a support member, is described. The mounting apparatus includes a connector joined to the object and having a tapered plug with a slot that extends inward from an outer wall of the plug. The apparatus further includes a base with an internal cavity extending between opposed side walls of the base. The base may be integral with the support member and has an aperture with an internal wall arrangement including an orifice wherein the aperture is dimensioned for reception of the plug. A keeper is slidable positioned within the internal cavity and has a finger that extends though the orifice and into the slot to retain the plug within the aperture.

Abstract: An adjustable accessory mounting clamp for mounting an accessory to an accessory rail, including an accessory band, a primary locking arm, a secondary locking arm, and a threaded adjustment rod that is anchored, at a first end, to the primary locking arm, extends through an aperture in the secondary locking arm, and is threadedly coupled to a cam lever pin of a cam lever, wherein the cam lever includes at least one camming surface, such that when the cam lever is in a closed position, the camming surface contacts an outer surface portion of the secondary locking arm to provide tension to the threaded adjustment rod, such that a distance between the primary locking claw and the secondary locking claw is adjusted to accommodate varying width accessory mounting rails.

Abstract: A mount comprising a connecting portion attachable to a firearm, a first member connected to the connecting portion to be rotatable about a first axis. a second member connected to the first member to be rotatable about a second axis substantially perpendicular to the first axis, and an attachment system connected to the second member for receiving an accessory. Also, a mount attachable to a firearm and having a dampener system connected to base and body portions thereof, the dampener system acting to dampen a recoil force produced by the firearm. Further, a mount attachable to a firearm and allowing a first rotation varying an azimuth of an accessory and a second rotation varying an angle of elevation of the accessory, and control means adjusting the second rotation to obtain a desired value and automatically producing the first rotation to correct a lateral drift of the firearm.

Abstract: An improved mounting assembly is provided that is configured to be releasably attached to a standard dovetail rail profile, wherein the initial clamping tension of a clamping assembly is adjustable. The mounting assembly includes a main body having a lower portion that is configured to engage a standard dovetail and an upper portion accessory receiving formation. The lower portion of the mounting assembly has a first engagement member extending downwardly along one side thereof for engaging one side of the dovetail rail and a clamping assembly to engage the opposing side of the dovetail rail. At least one spring and a retention nut are provided as part of the clamping assembly such that retention nut controls the preset spring tension thereby controlling the clamping force applied by the clamping assembly. A lock lever connected to the actuator arm selectively locks the position of the retention nut on the threaded shaft.

Abstract: Several improvements to the components and assembly method of a bolt-action firearm are disclosed. An improved bolt includes two separate members, which makes the bolt less expensive to manufacture while having a stronger extension handle. An improved takedown system and buttonless stop provide two easy ways to remove a bolt from a receiver when desired without misplacing any parts. An improved scope mount has a base connected to a receiver with two ends that substantially cover the top surface of the receiver and a middle portion that is narrowed over an opening to the receiver to accommodate a cartridge. A method of assembling a firearm involves providing a barrel with a threaded portion, fitting a crush washer over the threaded portion, inserting the threaded portion into a corresponding threaded portion of a receiver, and adjusting the barrel about the crush washer until a proper headspace is achieved.

Abstract: A fire arm that includes a mounting rail having remotely powered electrical connectors with which modified prior art tactical accessories, such as tactical lights, night vision devices, laser sighting modules and the like can be interconnected. More particularly, the mounting rail of the invention includes electrical connectors that are operably interconnected with a relatively large, long life battery mounted in the stock of the firearm.

Abstract: An improved floating rail system for mounting accessories on a firearm having a barrel including a chassis and a clamp adapted to attach the chassis about the barrel of the firearm. A plurality of elongate accessory mounting rails are attached to the chassis and extend parallel to an axis of the barrel. The accessory mounting rails are supported in the chassis radially spread apart from the barrel.

Abstract: The object of the invention is to realize further improvements of a telescopic-sight mounting system. Said object is achieved by a telescopic-sight mounting system 3 for a firearm 1 for mounting a telescopic sight 2 on the firearm 1, said telescopic-sight mounting system 3 having a locking retainer 7 that can be fixed on the firearm 1 and a locking foot 6 that can be fixed on the telescopic sight 2. The invention is characterized by an improved contact geometry between the locking retainer 7 and the locking foot 6.

Abstract: A sight mount for securing a telescopic sight to a mounting rail on top of a shell rejection mechanism of a rifle includes a bracket formed of thermoplastics and comprising a plurality of first threaded holes, a plurality of second threaded holes perpendicular to and offset with respect to the first threaded holes, a lengthwise bottom recess distal a top of the bracket and being slidably mounted to the mounting rail, and a lengthwise groove in the recess being proximate to the top of the bracket; a plurality of fasteners for securing the bracket to the telescopic sight by driving through the first threaded holes into the telescopic sight; and a plurality of fastening assemblies for securing the bracket to the mounting rail by driving through the second threaded holes.

Abstract: A sighting assembly for a firearm includes a scope and a mounting clamp. The mounting clamp includes a ring cap and a ring base that cooperate to surround and hold the scope. The mounting clamp has a rail clamp that includes a plurality of crowned portions that are configured to physically contact and grip a mounting rail.

Abstract: A mount for mounting a device to a firearm that includes a side plate, a support plate and a mounting rail. The side plate has a first end and a second end. The support plate extends from the first end of the side plate at approximately a right angle. Moreover, the support plate is adapted to support a device resting thereon. The mounting rail is coupled to the second end of the side plate. In addition, the mounting rail extends out from the side plate in a direction that is approximately opposite the direction the support plate extends from the side plate.

Abstract: Various detachable firearm mounting bracket device embodiments are provided. According to an embodiment, a detachable mounting bracket is adapted to allow users of various weapons platforms and field optical devices to rapidly and securely attach visual augmentation devices to a firearm. A detachable mounting bracket can comprise a housing to attach to a firearm stock, a clamping mechanism to secure the housing to a firearm, and a rail interface adapted to receive a visual augmentation device. The detachable mounting bracket device can be attached to a firearm with a clamp, screw closure, and a vertical interlock clamp. After the detachable mounting bracket is attached to a firearm, a user can easily and rapidly secure a visual augmentation device to the rail interface. Other embodiments are also claimed and described.

Abstract: An electronic device mounting system can be used to attach electronic devices, such as rangefinders and video cameras, to weapons. The mounting system includes a support portion for resiliently supporting the electronic device and a mounting portion for attaching the support portion and attached electronic device to a weapon. The support portion is universal in that it can be used with a number of interchangeable mounting portions. Each mounting portion is adapted for securing the support portion to a particular type of weapon or weapon accessory.

Abstract: A mount for mounting an accessory (19) on a weapon comprises a base plate (12) with an upper surface and a lower surface, to be connected with the accessory. The base plate (12) is clamped to a rail (10) on the weapon with the lower surface engaging the rail. Two aligned first grooves (23) in the upper surface extend in the longitudinal direction of the rail and a third groove (24) in the upper surface of the base plate, extends transversely of the first grooves. First protrusions (25) on the lower surface of the accessory guidingly engage the first grooves, and a third protrusion (26) on the lower surface of the accessory located between the first protrusions engages the third groove (24) to prevent displacement of the accessory along the first grooves.

Abstract: An apparatus generally includes a gun mount portion and a sight mount portion that are coupled together by a resilient member. The gun mount portion provides attachment to a gun and the sight mount portion provides attachment to a gun sight. The resilient member is configured to allow, when attached to the gun, a linear displacement of the sight mount portion relative to the gun mount portion along a longitudinal axis of the gun.

Abstract: A sighting telescope mounting system for a firearm. The firearm and/or the telescope in the desired position are aligned in an axial direction, with a pivot foot attached to the telescope and with a pivot holding device affixed to the firearm. The pivot foot and pivot holding device jointly form a pivot joint, which enables a pivot of the sighting telescope by a pivot angle around a pivot range, on a plane which is formed by the telescope and the axial direction of the firearm. A connection surface is arranged on the pivot holding device and a clamping surface is arranged on the pivot foot and forms a contact area with the connection surface so that the pivot foot is axially affixed. In the desired position, the contact area is arranged at a distance from an edge of the connection surface in a radial alignment and/or towards the telescope.

Abstract: A sighting telescope mounting system for a firearm. The firearm and/or the telescope, in a desired position, are aligned in an axial direction. A pivot foot is attached to the sighting telescope, and a pivot holding device is affixed to the firearm. The pivot foot and pivot holding device form a pivot joint that enables the telescope to pivot by a pivot angle around a pivot range on a plane formed by the telescope and the axial direction of the firearm. The pivot holding device has a connection surface and a clamping surface is arranged on the pivot foot and forms a contact area with the connection surface, so that the pivot foot is axially affixed. A clamping device is provided so that the connection surface and/or the clamping surface are arranged and/or designed compliantly. The pivot foot is axially held in a pre-tensioned state in the pivot holding device.

Abstract: A method and system for an inductively powering rail on a firearm to power accessories such as: telescopic sights, tactical sights, laser sighting modules, and night vision scopes. This is achieved by having primary and secondary electromagnets (U-Cores) on both the inductively powering rail and the accessory. Once the electromagnets are in contact, the accessory is able to obtain power through induction via the inductively powering rail. Accessories may be attached to various fixture points on the inductively powering rail and are detected by the firearm when attached and detached. When attached, power and data communications may flow between the accessory and a master CPU located on the firearm. Accessories that are attached to the inductively powering rail and have rechargeable power systems may be recharged via the inductive power rail. Further, accessories that have power that is not needed may be transferred to other accessories.

Abstract: A range finder adapted to be mounted to a scope. The range finder includes a main housing, range finding circuit received in the main housing and a mounting mechanism adapted to mount the main housing to a scope.

Abstract: A system for interchangeably mounting sighting devices on a plurality of firearms which includes one or more ring assemblies and one or more mounting assemblies. A sighting device is coupled to a mounting assembly using a ring assembly forming a mounting system. The system can then be mounted to one or more firearms using a single connector via two receptacles in the surface of the firearm. An entirely different sighting device and associated mounting system can be exchanged with the existing sighting device by removing the existing mounting system and replacing it with the new sighting device and mounting system. Each sighting device and mounting system are configured to have identical mounting assemblies that interface into standard receptacles in the firearm. In a similar manner a single sighting device and associated mounting system can be mounted on several firearms that each possess the two mounting receptacles.

Abstract: A device mount for a weapon with a stabilizing function is provided. In one embodiment, the device mount includes a device bracket, a stabilizing tube and at least one stabilizing member. The device bracket has a support plate and a side plate that extends generally at a right angle from the support plate. The stabilizing tube is movably coupled to the side plate. The at least one stabilizing member is received in the stabilizing tube. Moreover, the at least one stabilizing member is configured to stabilize motion of the device bracket.

Abstract: An accessory mount for a rifle for mounting a scope at an offset angle and a flashlight without obscuring the open sight of the rifle.

Abstract: An electro-optical device includes a mount assembly that reduces shock imparted to internal electro-optical components.

Abstract: A pivot mount base is assembled to or removed from the sight mounting rail of a firearm by a lever actuated cam energized rail clamping mechanism. The pivot mount base supports and provides for rotational and linear movement of a pivot shaft. A pivot shaft locator pin extending transversely through the pivot shaft is adapted to be selectively received in position controlling relation by pairs of aligned shaft location receptacles defined by the pivot mount base. A sight support device is fixed to the pivot shaft and serves to retain a firearm sighting device. The sight support device and sighting device are moveable between an operative position where the sighting device can be used to sight the firearm on a target and an inoperative position where the sighting device is positioned laterally offset from its operative position.

Abstract: An attachment system for mounting an accessory device to a longitudinal rail along the frame and forwardly of a trigger guard; said rail configured with at least two longitudinal grooves, one along each side of the rail, and further configured with a transverse slot in the surface of the rail; an accessory including a pair of longitudinal tongues, said tongues complimenting the longitudinal grooves for retaining the accessory device on the rail; a compression spring in a recess area formed in said accessory upwardly biasing a latch, on the accessory device housing and pivoting on a pivot pin; said latch containing a transversely disposed elongated protuberance having a width slightly less than the transverse slot of said rail for being received therein that co-acts with the transverse slot in said rail to prevent further longitudinal movement of the accessory device along the rail.

Abstract: A universal scope mount includes a housing and a pair of mounting assemblies. The housing has a chamber defined through front and rear ends thereof and having an inner contour conforming to an outer contour of a body of a scope or an accessory to be received therein, a channel downwardly exposed and extending parallel to the chamber and a pair of projections formed along respective opposite sides of the channel. The pair of mounting assemblies is used to respectively secure a front end portion and a rear end portion of the housing to the mount base of the firearm. Each mounting assembly includes a slider to be slidably received in the channel of the housing and supported by the projections of the housing, a mount member to be disposed between the housing and the mount base of the firearm, securing means to securely connect the mount member to the upper attachment surface of the mount base of the firearm, and fastening means to reliably assemble the housing, the slider and the mount member together.

Abstract: An improved mounting assembly is provided that is configured to be releasably attached to a standard dovetail rail profile, wherein the initial clamping tension of the clamping actuator is adjustable. The mounting assembly generally includes a main body having a lower portion that is configured to engage a standard dovetail and an upper portion accessory receiving formation. The lower portion of the mounting assembly has a first engagement member extending downwardly along one side thereof for engaging one side of the dovetail rail and a clamping assembly to engage the opposing side of the dovetail rail. At least one spring and a retention nut are provided as part of the clamping assembly such that retention nut controls the preset spring tension thereby controlling the clamping force applied by the clamping assembly.

Abstract: An exemplary scope mount includes a connecting base and a buffer. The connecting base includes a fixing groove for connecting a gun body. The fixing groove extending passing through two opposite sides of the connecting base. The connecting base also includes a receiving groove opposite to the fixing groove for receiving a buffer. The connecting base further includes two securing grooves at two opposite sides of the receiving groove for fixing a scope. The buffer can decrease the effect of the recoil strength to the lens inside the scope. In operation, the instant pull from the gun body to the scope mount and from the scope to internal lens of the scope can be correspondingly minimized, thereby protecting the internal lens of the scope. Moreover, the connecting base can be rapidly mounted to or removed from gun body due to fixing groove.

Abstract: An attaching system for mounting a device to a weapon is provided. The attaching system includes an attaching ring, a mounting rail and a threaded attaching member. The attaching ring includes a weapon attaching portion, a retaining portion and an extending portion. The weapon attaching portion is configured to attach to a weapon. The retaining portion is configured to receive and hold a mounting rail. The retaining portion includes a retaining aperture. The extended portion is coupled between the weapon attaching portion and the retaining portion. The extending portion has a select length to space the weapon attaching portion from the retaining portion a select distance. The mounting rail is configured to be received in the retaining portion. The mounting rail has a threaded recess. The threaded attaching member is configured to pass through the retaining aperture and to threadably engage the threaded recess of the mounting rail.

Abstract: A mounting assembly for mounting accessories to a dovetail rail on a firearm is provided. The mounting assembly includes a main body having a lower portion with a first engagement member extending downwardly along one side thereof and a clamping assembly installed into the main body opposite the engagement member such that the clamping assembly can be engaged and disengaged with the dovetail rail to hold the mounting assembly on the dovetail rail. In addition, a buffer pad is provided between the clamping assembly and the interface point on the dovetail rail to protect the rail from wear. The clamping assembly includes a means for retracting the buffer pad when the clamping assembly is in the disengaged position, the retraction means preferably being magnetic. Such that the buffer pad is held out of the way when mounting or dismounting the mounting assembly.

Abstract: A rear gun sight device for a rifle having a receiver and cover, the receiver having a tee shaped slot on the top rear of the receiver. This slot is designed to accept and retain a recoil assembly. The invention replaces the rear portion of the recoil assembly allowing the invention to perform the function of the original rear portion of the recoil assembly as well as provide a rear sight for the rifle. This invention is comprised of a sight base provided with a tee shaped base to engage the tee shaped slot in the top rear trunion of the rifle's receiver, a spring boss to accept the end of the recoil spring when assembled in the recoil assembly, a spring guide to guide the recoil spring, a sight component assembly comprised of windage and elevation adjustment components as well as aperture sight components, and cover retention elements.

Abstract: A sighting assembly for a firearm includes a scope and a mounting clamp. The mounting clamp includes a ring cap and a ring base that cooperate to surround and hold the scope. The ring cap and ring base securely grip the scope without damaging the scope. Clamping forces are generally tangent to the scope to minimize or limit the formation of dents, grooves, or other types of marring and/or damage to optics or the body of the scope.

Abstract: A clamping device for coupling optical devices in coaxial, tandem alignment includes a front clamp assembly that has elastically deformable split collar halves tightenable onto a front optical device by a screw tightenable into bores disposed transversely through a pair of arms extending radially from the split collar halves. A rear optical device support protrudes rearward from the front clamp assembly, and has a releasable fastener such as a screw or dovetail joint for supporting a rear optical device in coaxial alignment with the front optical device. Preferably, the arm is mounted to the front clamp assembly by means of a pivotable joint which is latchable in a first, rearward position, and a second, forward position in which the rear optical device is positioned along the side of the front optical device, so that the front device may be used independently of the rear device.

Abstract: An electronic device mounting system can be used to attach electronic devices, such as rangefinders and video cameras, to weapons. The mounting system includes a support portion for resiliently supporting the electronic device and a mounting portion for attaching the support portion and attached electronic device to a weapon. The support portion is universal in that it can be used with a number of interchangeable mounting portions. Each mounting portion is adapted for securing the support portion to a particular type of weapon or weapon accessory.

Abstract: Several improvements to the components and assembly method of a bolt-action firearm are disclosed. An improved bolt includes two separate members, which makes the bolt less expensive to manufacture while having a stronger extension handle. An improved takedown system and buttonless stop provide two easy ways to remove a bolt from a receiver when desired without misplacing any parts. An improved scope mount has a base connected to a receiver with two ends that substantially cover the top surface of the receiver and a middle portion that is narrowed over an opening to the receiver to accommodate a cartridge. A method of assembling a firearm involves providing a barrel with a threaded portion, fitting a crush washer over the threaded portion, inserting the threaded portion into a corresponding threaded portion of a receiver, and adjusting the barrel about the crush washer until a proper headspace is achieved.

Abstract: A riflescope includes an objective lens component slidably supported on a guide track oriented perpendicular to an optic axis of the objective lens component for lateral, non-pivoting movement of the objective lens component in or along a plane perpendicular to the optic axis. Movement of the objective lens component shifts an image of a target in the field of view relative to an aiming mark displayed in the riflescope. In a preferred embodiment, a transparent optical window is fixedly mounted forwardly of the objective lens element and sealed to the riflescope housing.

Abstract: A scope mount base design which readily accepts onto a preexisting rear sight base without any alteration of the sight base except for the easy removal of the original sight leaf and mainspring. This scope mount invention achieves solid lockup by the use of the appropriate sized threaded support fixtures and scope mount configuration to successfully engage these rear sight slots that originally contained the sight leaf and mainspring, and thus achieve strong lockup of the scope mount to the sight base.

Abstract: A system and method for mounting a telescopic sight or “scope” to a firearm. The system is convertible or universal, in that it includes interchangeable mounting plate inserts allowing the mounting plate to be installed onto two or more different types of firearms having differing mounting hole configurations.