Abstract: Devices and method for converting collapsible firearm stocks are provided. In one embodiment, a conversion device for converting a stock is provided, the stock comprising a locking pin, configured to slide along a receiver extension having a plurality of position holes and lock into position, the conversion device comprising: a first insert having a first plug configured to insert into a first position hole of the plurality of position holes; a second insert having a second plug configured to insert into a second position hole of the plurality of position holes; wherein inserting the first and second plugs into the first and second position holes, respectively, covers all of the plurality of position holes except for a single position hole for receiving the locking pin of the stock; and wherein the single position hole converts the stock from being collapsible to fixed on the firearm.

Abstract: Flip sight systems having multiple configurations for use with firearms in accordance with various embodiments of the invention are disclosed. In one embodiment, a flip sight system is provided, comprising: a front sight assembly comprising: a front base, a front pivot joint; and a front sight; a rear sight assembly comprising: a rear base, a rear pivot joint, and a rear sight; wherein the flip sight system includes a first deployed configuration where the front sight and the rear sight are offset to the attached optics such that the flip sight system operates as primary sights for close range targets, a second deployed configuration where the front sight and the rear sight are in-line with the attached optics such that the flip sight system operates as co-witness or backup sights to the attached optics, a first collapsed configuration for storage, and a second collapsed configuration for storage.

Abstract: Examples of a self-releasing magazine and a magazine follower assembly thereof for firearms are described. The magazine follower assembly includes a casing and a self-releasing actuator received in the casing. When in use, the magazine follower assembly generally moves along a first axis with respect to the casing between a first position in the magazine when the magazine is fully loaded and a second position in the magazine when the magazine contains no ammunition cartridge. When the magazine follower assembly is at the second position in the magazine, the self-releasing actuator is configured to actuate a magazine release mechanism of the firearm to disengage the magazine from the firearm so that the magazine is detachable from the firearm.

Abstract: A preferred embodiment of a self-locking door assembly includes a door whose hinged-side connects to one side of a door frame by at least one hinge having two pivot joints. One of the pivot joints is mounted to the door frame and the other is mounted to the inside of the door. The free end of the door carries a latch member which engages an underside of the opposite side of the door frame when the door is partially or fully closed. After the latch engages the frame, forcing the hinged side of the door closed causes the hinge to toggle, holding the door closed under force and takes up play in the pivot joints and/or latch. For security, the pivot joints and latch are concealed when the door assembly is closed.