Abstract: A barrel insert is disclosed. A firearm may use a target barrel or another barrel, such as a standard barrel. The stock of a firearm may have a barrel receptacle that is shaped to hold a larger barrel. The larger barrel may be untapered. The barrel insert may be used to adapt a barrel receptacle to fit a smaller barrel. The smaller barrel may be tapered. The barrel insert may have a texture that substantially matches a texture of the firearm.

Abstract: A helmet for use by an operator or rider of a motorized vehicle, such as a motorcycle or snowmobile, includes a ventilation system with an air intake subsystem, an air diffusion subsystem, and an air exhaust subsystem. The air intake subsystem includes a plurality of air intake vents located in the outer shell of the helmet, as well as a plurality of air intake holes located within the foam liner of the helmet. The air diffusion subsystem includes a plenum located between an upper portion and a lower portion of the foam liner, which can act as a pressure chamber to forcefully direct air onto the user's head. The air exhaust subsystem includes one or more exhaust ports that create a vacuum near the back of the helmet to draw large volumes of airflow through the helmet as it travels forward.

Abstract: A linear lost motion mechanism is located within a tubular handle of a machine, such as a concrete finishing machine. The linear lost motion mechanism includes a pitch block configured to selectively frictionally lock with the tubular handle or a component attached to the tubular handle using a biasing spring. The linear lost motion mechanism can perform a number of functions, such as controlling a blade pitch adjustment system of a concrete finishing machine.

Abstract: A selectively communicatable hydraulic nipple is provided which includes an upper and lower communications component adapted to communicate with tools landed inside the hydraulic nipple. Each communications component communicates with a control line used by the hydraulic nipple. An operator is allowed to selectively communicate with tools landed inside the nipple via the upper and lower communications components via the nipple control line. As a result, should the TRSCSSV control line loose integrity, the operator has the option of utilizing the nipple control line to continue oil and gas production without the need for well modifications. Alternatively, an operator could land a chemical injection tool, with an injection string suspended therefrom, in the nipple and inject chemicals into the well via the nipple control line.

Abstract: A firearm lock that is inserted through the magazine port of a suitable firearm. The firearm lock extends from the magazine port into the bolt compartment of the firearm. The lock blocks the firearm bolt from returning from a retracted position, which may prevent the firearm from being disassembled, preventing circumvention of the lock. The lock may have a projection that can be moved into the magazine release mechanism recess to secure the lock in place. The firearm lock may be unlocked by hand or may require a key or a combination.

Abstract: A locking device for multiple-section telescoping tubes wherein a smaller tube is telescopically retractable into or extensible from within a larger tube includes a pair of opposing blocks, disposed within the telescoping tubes, one block being attached to the smaller tube, the other block being configured to move laterally with respect to the first block when the blocks are moved longitudinally with respect to each other. Depending on the direction of longitudinal movement of the blocks, one block may be caused to bear against an inner side of the larger tube to resist retraction of the smaller tube, or the blocks may be allowed to move away from the inner side of the larger tube to allow free sliding extension of the smaller tube. The device also includes means for selectively longitudinally moving one of the blocks with respect to the other, so as to allow free sliding retraction of the smaller tube, when desired.

Abstract: A kit for converting an existing wireline retrievable surface controlled subsurface safety valve (170, 270, 370) into a bypass passageway apparatus (100) allowing the injection of production-enhancing fluid into a wellbore while maintaining the operation of the closure member (374). Bypass passageway (280) can extend between upper (260) and lower (275) adapters external to the existing wireline retrievable surface controlled subsurface safety valve (270) to allow fluid injection bypass thereof. Conversion kit can include a tubing string hanger to suspend a velocity tubing string (407, 507), a gas lift valve (475) for gas lift operations, a locking mandrel (220), and/or a spacer tube (240).

Abstract: An embodiment is directed to a method for selectively routing a DNS request in which a DNS request to translate a domain name is received from a local client device. The DNS request is directed to a remote DNS server on a remote network. A link status to the remote network is identified. If the link status indicates that a connection to the remote network is not possible, the DNS request is routed to a locally embedded DNS server. If the link status indicates that a connection to the remote network is possible, the DNS request is routed to the remote DNS server on the remote network.

Abstract: A monopod for a firearm is disclosed. The monopod has a body and a leg that can extend from the body. The monopod may fit into a pistol grip of a firearm, such as a rifle. Once installed, the leg of the monopod may be extended from the pistol grip of the firearm and secured by a pin. When the leg is retracted into the body, the leg is kept in place by the pin, which opposes a force provided by a constant force spring. The monopod may be used by a user to stabilize the firearm on a surface.

Abstract: The present disclosure is directed to a method comprising introducing into a well bore a fluid comprising a zwitterionic polymer. The polymer is prepared by inverse emulsion polymerization of at least one monomer Ab comprising a betaine group and optionally one or more nonionic monomers Ba. The well bore is chosen from a natural gas well bore and an oil well bore.

Abstract: A mounting rail for a firearm is disclosed. The mounting rail may be a picatinny rail, a weaver rail, or the like, which allows tools such as lights or lasers to be attached to a firearm. The mounting rail is reversible and may be mounted within a portion of the firearm, such as the forend. The other side of the rail may match the finish and texture of the firearm so that the mounting rail is hidden from view when reversed.

Abstract: The present disclosure is directed to a gas lift system adapted to provide a gas injection point to a deeper location in a wellbore. A turn-over suspension mandrel can be landed inside a side pocket mandrel and connected to a gas lift valve on one end and a coil on the other end. A length of production tubing can extend from the side pocket mandrel. The production tubing can include a production packer to seal the annulus between the tubing and the well casing. The turn-over suspension mandrel can be constructed such that gas entering the gas lift valve is directed down through the coil and into the wellbore beneath the production packer. A plug can be placed at the bottom of the coil in order to prevent blowouts during installation of the gas lift system. An alternative embodiment of the present disclosure provides a coil and plug hung from a gas lift valve of a pack-off assembly.

Abstract: A recoil reduction system for use with firearms. The recoil reduction system includes a cam coupled with a torsion spring which can provide resistance to a sliding member of a firearm, thus reducing recoil. The torsion spring and cam can be used as part of a recoil reduction system that is installed in a handgrip or in a forend. Accessories may be attached to the recoil reduction mechanism in order to gain the benefits of recoil reduction.

Abstract: A wellhead assembly for an injection tubing string is provided which allows a master valve to be closed without damaging the injection tubing string while still allowing for the use of a back pressure valve to isolate the tree. Wellhead assemblies and related methods of the present invention include a flange adapted to be connected between a wellhead and a Christmas tree. The assembly also includes a mandrel adapted to being inserted into the longitudinal bore of the flange, the mandrel having a port for communicating with an injection port which extends radially through the flange. The assembly further includes a hanger adapted to connect to the upper end of the injection string, wherein the hanger is further adapted to land in the longitudinal bore of the mandrel. The hanger includes a communication passageway for facilitating fluid communication between the port of the mandrel and the injection tubing string.

Abstract: A downhole device used to divert fluid flow out of a work string into an annulus. The downhole device is activated by the movement of a plurality of pistons within the downhole device. Fluid flow through a restriction of the downhole device creates an increase in fluid pressure causing the movement of the pistons. The pistons move a flow tube between various locations within the device. In one location, the flow tube prevents fluid flow to the annulus while in another location the flow tube allows fluid flow to be diverted into the annulus. The downhole device may include a locating sleeve having a continuous j-track allowing the flow tube to be selectively retained at the various locations within the downhole device. Fluid flow through the downhole is used to cycle the device between diverting fluid flow to the annulus and forcing fluid flow down the work string.

Abstract: A choke for removing large diameter particulate matter from an oil or natural gas well includes a housing having a chamber with an integral solids receptacle. The chamber is in communication with a flow stream outlet and a flow stream inlet. The flow stream inlet is located below the flow stream outlet. The flow stream inlet directly adjoins the integral solids receptacle in the chamber. The choke includes a solids removal outlet located below the flow stream inlet in communication with the chamber for flowing particulate from the chamber when actuatedby a user. The choke includes a needle disposed in a bonnet connected to the chamber above the flow stream inlet for controlling the flow stream from the flow stream inlet to the flow stream outlet by engaging a choke face of a seat with the needle.