Abstract: A follower for a firearm magazine is provided. In some embodiments, the follower has: a cartridge platform coupling a first wall to a second wall. The first wall, the second wall, and the platform define a receiving space for receiving at least a portion of a magazine spring. At least one of the first wall or the second wall has a nonlinear end profile shaped to translate a lateral spring force into a longitudinal spring force.

Abstract: This disclosure describes systems, methods, and apparatus for a barrel support for a for a firearm stock. In one example, the barrel support has an elongate frame with a longitudinal axis extending between a fore portion and an aft portion, a first concave barrel recess shaped to support a first barrel, the first concave barrel recess positioned on a first side of the elongate frame. The exemplary barrel support also has a second concave barrel recess shaped to support a second barrel, the second concave barrel recess positioned on a second side of the elongate frame. In this example the first barrel is a tapered barrel, and the second barrel is a straight barrel.

Abstract: An accessory mounting interface and method are disclosed. The interface has an upper portion having a firearm accessory and at least one through hole extending from a first surface to a second surface of the upper portion, the upper portion having a first post portion with a first side surface and a first flange. A first elongated fastener is arranged through the through hole and has a first end extending below the second surface of the upper portion. The interface also has a second post portion that is movable between a first configuration defining a first transverse distance between the first and second side surfaces and a second configuration defining a second transverse distance between the first and second side surfaces, the first transverse distance greater than the second transverse distance. The first flange substantially opposes the second flange when the second post portion is in the first configuration.

Abstract: Described is a technology by which a virtual machine may be safely migrated to a computer system with a different platform. Compatibility of the virtual machine may be checked by comparing the virtual machine's capabilities against those of the new platform. To ensure compatibility, when created the virtual machine may have its capabilities limited by the lowest common capabilities of the different platforms available for migration. Computer systems may be grouped into migration pools based upon similar capabilities, and/or a virtual machine may be mapped to certain computer systems based upon capabilities needed by that virtual machine, such as corresponding to needed performance, fault tolerance and/or flexibility.

Abstract: An accessory mounting interface for a firearm, and a related method, are disclosed. The interface has a firearm accessory, a first elongated fastener, and a second fastener rotationally mated to the first elongated fastener. The first elongated fastener has right-handed threading and is arranged through a through hole in the firearm accessory with a first end extending below first and second halves of a first slot protrusion of the firearm accessory. The second fastener has a length greater than a width, the length measured along a longitudinal axis of the second fastener, the second fastener having a plurality of straight edges. At least one of the plurality of straight edges prevents the second fastener from rotating further than a closed position when the at least one of the straight edges abuts a sidewall of an elongated slot in the firearm.

Abstract: A magazine assembly for a firearm and a related method are disclosed. The assembly has a magazine housing defining a track, and a follower assembly. The magazine housing is configured to constrain a cartridge as the cartridge is moved within the magazine assembly such that majority of a proximal surface area of the cartridge does not contact the magazine housing, and a distal tip of the cartridge does not contact the magazine housing.

Abstract: A stock and related methods for a firearm are disclosed. An exemplary stock includes a distal portion for interfacing with a firearm, the distal portion having one of a lock catch or a lock and one of a detent or a detent notch distinct from the one of a lock catch or a lock. The exemplary stock further includes a proximal portion, the proximal portion having the other one of a lock catch or a lock and the other one of a detent or a detent notch. The exemplary stock has a folded configuration and an unfolded configuration. The exemplary lock is shaped to engage the lock catch to selectively maintain the stock in the unfolded configuration. The exemplary detent is shaped to engage the detent notch to selectively maintain the stock in the folded configuration.

Abstract: A drum magazine assembly and methods are described. A drum assembly has a follower assembly, a drum body, a spring assembly, and a feed tower assembly. The follower assembly biases cartridges towards an exit of the feed tower assembly. The follower assembly has a plurality of dummy cartridges, the plurality of dummy cartridges having a leading dummy cartridge and a last dummy cartridge, and a plurality of links including a leading link and a last link. The last dummy cartridge rotates relative to the last link and the leading link, and the leading dummy cartridge has a bolt catch engagement feature.

Abstract: An accessory mounting interface for a firearm is provided. The accessory mounting interface has a firearm accessory, a first elongated fastener, a second fastener, and an elongated slot in a firearm. The second fastener has two straight edges parallel to each other, and at least one of the two straight edges prevent the second fastener from rotating beyond a closed position once a portion of the second fastener has passed through and at least partially cleared the elongated slot.

Abstract: A quick detach mount and method are disclosed. The mount includes an accessory receiving portion shaped to receive a quick detach interface, and a first arm extending from the accessory receiving portion. The quick detach mount is shaped to receive a first fastener and a second fastener, whereby the quick detach mount is shaped distribute a force from the accessory receiving portion.

Abstract: A follower for a firearm magazine is provided. In some embodiments, the follower has: a cartridge platform coupling a first wall to a second wall. The first wall, the second wall, and the platform define a receiving space for receiving at least a portion of a magazine spring. At least one of the first wall or the second wall has a nonlinear end profile shaped to translate a lateral spring force into a longitudinal spring force.

Abstract: This disclosure describes systems, methods, and apparatus for a barrel support for a for a firearm stock. In one example, the barrel support has an elongate frame with a longitudinal axis extending between a fore portion and an aft portion, a first concave barrel recess shaped to support a first barrel, the first concave barrel recess positioned on a first side of the elongate frame. The exemplary barrel support also has a second concave barrel recess shaped to support a second barrel, the second concave barrel recess positioned on a second side of the elongate frame. In this example the first barrel is a tapered barrel, and the second barrel is a straight barrel.

Abstract: This disclosure describes systems, methods, and apparatus for a selectable barrel support that can be inserted into a forend of a firearm stock to support a first barrel type and flipped, rotated, or otherwise moved to support a second barrel type (or third or fourth barrel types). A tensioning mechanism is provided. Bull and tapered barrels are examples of two barrel types that the selectable barrel support can be used to support. The selectable barrel support enables a firearm owner or gunsmith to exchange barrel types on a firearm without having to switch out the firearm stock.

Abstract: A follower for a firearm magazine is provided. In some embodiments, the follower has: a platform shaped to interface with a firearm cartridge; a first side face extending longitudinally from the platform and having a first end opposing the platform; and a second side face extending longitudinally from the platform and having a second end opposing the platform. The first side face and the second side face may define a receiving space for receiving at least a portion of a magazine spring. At least one of the first end and the second end may have a nonlinear profile shaped to translate a lateral spring force into a longitudinal spring force.

Abstract: An accessory mounting interface for a firearm is provided. The accessory mounting interface has a firearm accessory, a first elongated fastener, a second fastener, and an elongated slot in a firearm. The second fastener has two straight edges parallel to each other, and at least one of the two straight edges prevent the second fastener from rotating beyond a closed position once a portion of the second fastener has passed through and at least partially cleared the elongated slot.

Abstract: This disclosure describes systems, methods, and apparatus for a selectable barrel support that can be inserted into a forend of a firearm stock to support a first barrel type and flipped, rotated, or otherwise moved to support a second barrel type (or third or fourth barrel types). A tensioning mechanism is provided. Bull and tapered barrels are examples of two barrel types that the selectable barrel support can be used to support. The selectable barrel support enables a firearm owner or gunsmith to exchange barrel types on a firearm without having to switch out the firearm stock.

Abstract: A follower for a firearm magazine is provided. In some embodiments, the follower has: a platform shaped to interface with a firearm cartridge; a first side face extending longitudinally from the platform and having a first end opposing the platform; and a second side face extending longitudinally from the platform and having a second end opposing the platform. The first side face and the second side face may define a receiving space for receiving at least a portion of a magazine spring. At least one of the first end and the second end may have a nonlinear profile shaped to translate a lateral spring force into a longitudinal spring force.

Abstract: An accessory mounting interface for a firearm is provided. The accessory mounting interface has a firearm accessory, a first elongated fastener, a second fastener, and an elongated slot in a firearm. The second fastener has two straight edges parallel to each other, and at least one of the two straight edges prevent the second fastener from rotating beyond a closed position once a portion of the second fastener has passed through and at least partially cleared the elongated slot.

Abstract: A padded strap is provided, which comprises a unitary strap member forming a tube and an inserted pad. The unitary strap member has at least two sections, at least one of the sections configured to form a pad casing section which can retain the inserted pad, and the another section comprising a substantially flat section abutting the pad casing section. The area between the pad casing section and the substantially flat section comprises a hollow, tapering transition area. The unitary strap member comprises at least one sealable opening at an end of the unitary strap member. The inserted pad is inserted through the sealable opening and retained in the pad casing section, and the pad is comprised of at least one outer layer of resilient, low-friction material and a cushioning layer.

Abstract: A drum magazine assembly and methods are described. A drum assembly has a follower assembly, a drum body, a spring assembly, and a feed tower assembly. The follower assembly biases cartridges towards an exit of the feed tower assembly. The follower assembly has a plurality of dummy cartridges, the plurality of dummy cartridges having a leading dummy cartridge and a last dummy cartridge, and a plurality of links including a leading link and a last link. The last dummy cartridge rotates relative to the last link and the leading link, and the leading dummy cartridge has a bolt catch engagement feature.