The present disclosure relates to a modular firearm frame adapter that aid in making compatible a slide associated with a first firearm and a frame associated with a second firearm. The compatibility is such that the slide associated with a first firearm and a magazine associated with a second firearm being able to function properly as a single integrated firearm. This system includes an adapter, and one or more adapter elements that aids allowing the modular firearm to function properly.

The present disclosure relates to a modular firearm frame adapter that aid in making compatible a slide associated with a first firearm and a frame associated with a second firearm. The compatibility is such that the slide associated with a first firearm and a magazine associated with a second firearm being able to function properly as a single integrated firearm. This system includes an adapter, and one or more adapter elements that aids allowing the modular firearm to function properly.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.

A follower for a magazine of a firearm includes an underside for attachment to a spring within the magazine, a spine extending downward from a rear part of the follower, and an upper surface for interfacing with at least one cartridge inserted into the magazine. The upper surface includes a top portion and a bottom portion, and the bottom portion includes a curved surface.

A follower for a magazine of a firearm includes an underside for attachment to a spring within the magazine, a spine extending downward from a rear part of the follower, and an upper surface for interfacing with at least one cartridge inserted into the magazine. The upper surface includes a top portion and a bottom portion, and the bottom portion includes a curved surface.

The invention relates to a capacity limiting assembly that provides substantially irreversible alteration of a box magazine to limit its cartridge capacity wherein the box magazine comprises a magazine housing having a vertical dimension Y.sub.M, a magazine spring having at least 1 coil, and a follower. The assembly includes a limiter body and a lock plate. The limiter body has a top edge engageable with a bottom surface of the follower that is operatively associated with a top of the magazine spring extending into the cartridge reservoir and is configured to be disposed substantially within the at least one coil of the magazine spring. The limiter has a vertical dimension Y.sub.L that is less than the vertical dimension Y.sub.M of the magazine housing, and a limiter bottom edge that is engageable to a lock plate. The lock plate of the assembly has a top surface engageable to the bottom surface of the limiter body and bottom surface engageable to the lock plate of the magazine when the lock plate is placed against a bottom edge of the magazine housing. When a top surface of the lock plate is bonded to the limiter body, the limiter substantially irreversibly reduces the capacity of the box magazine. Also included are magazines fitted with the assembly and related methods of reducing the capacity of magazines.

The invention relates to a capacity limiting assembly that provides substantially irreversible alteration of a box magazine to limit its cartridge capacity wherein the box magazine comprises a magazine housing having a vertical dimension Y.sub.M, a magazine spring having at least 1 coil, and a follower. The assembly includes a limiter body and a lock plate. The limiter body has a top edge engageable with a bottom surface of the follower that is operatively associated with a top of the magazine spring extending into the cartridge reservoir and is configured to be disposed substantially within the at least one coil of the magazine spring. The limiter has a vertical dimension Y.sub.L that is less than the vertical dimension Y.sub.M of the magazine housing, and a limiter bottom edge that is engageable to a lock plate. The lock plate of the assembly has a top surface engageable to the bottom surface of the limiter body and bottom surface engageable to the lock plate of the magazine when the lock plate is placed against a bottom edge of the magazine housing. When a top surface of the lock plate is bonded to the limiter body, the limiter substantially irreversibly reduces the capacity of the box magazine. Also included are magazines fitted with the assembly and related methods of reducing the capacity of magazines.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.

A firearm as disclosures herein comprises a main receiver body, a barrel, a breech bolt structure, a buffer assembly, a trigger group assembly, a bolt catch and at least one of an auto-sear, a magazine adapter and a breech bolt anti-rotation structure. The main receiver body is preferably of a monolithic construction whereby the handguard and breech bolt carrying bore can be manufactured from a single piece of material. The auto-sear is tripped by engagement with a buffer of the buffer assembly. The magazine adapter has an exterior surface structure engaged with a mating interior surface structure of a magazine well space of the main receiver body. A distal end portion of the breech bolt anti-rotation structure is engageable by the buffer for limiting forward travel of the buffer when the barrel is detached from the main receiver body.