The disclosed firing assembly for use in a firearm according to various aspects of the present technology may comprise a hammer configured to pivot between a cocked position and a firing position. The firing assembly may also comprise a hammer release assembly configured to releasably retain the hammer rearwardly in the cocked position. The hammer release assembly may comprise a housing axially connected to the firearm and a spring-loaded disconnector. In addition, the firing assembly may comprise a biasing component configured to bias the hammer and housing forwardly and upwardly, respectively. The firing assembly may further comprise a trigger assembly connected to the hammer release assembly via a trigger bar and configured to controllably operate the hammer release assembly.

Disclosed is a linear trigger mechanism for a firearm. In certain examples, the trigger mechanism includes a trigger housing defining a linear pathway and configured to house a trigger, a sear, and a disconnector. The trigger has a top surface, and a sear ramp and a disconnector ramp disposed on the top surface. The trigger is configured to move along the linear pathway that is substantially parallel with a bore axis of the firearm. The trigger mechanism also includes a trigger return compression spring configured to urge the trigger into a default position, and a sear compression spring configured to urge the sear into a default position.

Disclosed is a linear trigger mechanism for a firearm. In certain examples, the trigger mechanism includes a trigger housing defining a linear pathway and configured to house a trigger, a sear, and a disconnector. The trigger has a top surface, and a sear ramp and a disconnector ramp disposed on the top surface. The trigger is configured to move along the linear pathway that is substantially parallel with a bore axis of the firearm. The trigger mechanism also includes a trigger return compression spring configured to urge the trigger into a default position, and a sear compression spring configured to urge the sear into a default position.

Disclosed is a linear trigger mechanism for a firearm. In certain examples, the trigger mechanism includes a trigger housing defining a linear pathway and configured to house a trigger, a sear, and a disconnector. The trigger has a top surface, and a sear ramp and a disconnector ramp disposed on the top surface. The trigger is configured to move along the linear pathway that is substantially parallel with a bore axis of the firearm. The trigger mechanism also includes a trigger return compression spring configured to urge the trigger into a default position, and a sear compression spring configured to urge the sear into a default position.

Disclosed is a linear trigger mechanism for a firearm. In certain examples, the trigger mechanism includes a trigger housing defining a linear pathway and configured to house a trigger, a sear, and a disconnector. The trigger has a top surface, and a sear ramp and a disconnector ramp disposed on the top surface. The trigger is configured to move along the linear pathway that is substantially parallel with a bore axis of the firearm. The trigger mechanism also includes a trigger return compression spring configured to urge the trigger into a default position, and a sear compression spring configured to urge the sear into a default position.

Trigger groups for semi-automatic firearms have a frame, a hammer connected to the frame and movable between a cocked position and a striking position, the hammer being biased toward the striking position, a trigger element connected to the frame and movable by a user between a forward position and a rearward position, a selector connected to the frame and movable between at least a first position and a second position, a disconnector having a hammer engagement facility adapted to selectably engage the hammer, a disconnector control element movable between a first control position and a second control position, the disconnector being operably engaged to the disconnector control element, the disconnector operable to move in a first range of motion when the disconnector control element is in the first control position, and in a second range of motion when the disconnector control element is in the second control position.

A system that allows a person to adjust the tension of the fire control mechanism of a firearm from outside the firearm so the firearm does not need to be disassembled to make such adjustments. The system has a modified mainspring housing or modified grip safety that supports a spring engaging mechanism which engages the sear spring of the fire control mechanism. In one configuration, first and second apertures extend through the housing body and an engaging device, such as a screw, is received in each aperture to contact different segments of the sear spring. From outside the firearm, the user moves a device forward or rearward in an aperture to apply more or less force to the sear spring segment to adjust the fire control mechanism. The sear spring can be modified so a sear spring segment has an enlarged area that is contacted by its engaging device.

A system that allows a person to adjust the tension of the fire control mechanism of a firearm from outside the firearm so the firearm does not need to be disassembled to make such adjustments. The system has a modified mainspring housing or modified grip safety that supports a spring engaging mechanism which engages the sear spring of the fire control mechanism. In one configuration, first and second apertures extend through the housing body and an engaging device, such as a screw, is received in each aperture to contact different segments of the sear spring. From outside the firearm, the user moves a device forward or rearward in an aperture to apply more or less force to the sear spring segment to adjust the fire control mechanism. The sear spring can be modified so a sear spring segment has an enlarged area that is contacted by its engaging device.

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.