Abstract: For an automatic or semi-automatic weapon or gun an arrangement for aligning and coupling together the weapon receiver and barrel groups that includes a pin secured within and across the receiver interior to receive and seat a lateral slot formed in the barrel, the pin for aligning and functioning as a pivot point for seating the barrel into the receiver, the receiver further including a screw journaled through the receiver bottom portion, a threaded end thereof to align with and turn into a threaded hole formed in the barrel undersurface when said barrel lateral slot is seated on the pin, the screw including a head without the receiver for manual turning.

Abstract: For an automatic or semi-automatic weapon or gun, that includes a top strap for covering an open top portion of a weapon receiver group. The invention in a connector-less locking arrangement for that top strap that includes spaced apart flanges arranged at intervals along the top strap undersurface to project outwardly from the sides thereof to fit and travel beneath inwardly facing rail sections formed in the receiver top edges, and includes a detent fitted into the receiver to project therefrom, that, when the top strap is fitted thereover, travels into a seat formed in the top strap undersurface, aligning and maintaining the top strap in covering engagement over that receiver open open top portion.

Abstract: For an automatic or semi-automatic weapon or gun that utilizes a feed block arranged to position and pass cartridges therethrough between a magazine and barrel breach, that feed block including forwardly projecting spaced apart ears that extend in that plane of the feed block to fit into complementary slots in a barrel receiver providing a connector-less coupling therewith.

Abstract: With an automatic or semi-automatic weapon or gun, an improved component coupling arrangement for providing interlocking component assemblies of the receiver and barrel groups of the weapon, where, with a single screw coupling only in conjunction and interaction with a connector-less receiver top strap, the barrel and receiver groups are rigidly joined together, maintaining a cartridge feed block therewith that has a throat for receiving cartridges fed therethrough, which throat is in alignment with and between a barrel breech and in a cartridge discharge of a magazine juxtaposed thereto positioned to and between the barrel and receiver groups.