A hammer strut support (150, 156, 160, 162, 166) in a firearm which supports or aligns a free end (134) of a pivotally mounted hammer strut (116), and physically blocks it from becoming lodged in a position, typically under a crosspin (120) such as a sear spring stop pin, that would preclude subsequent proper reassembly of firearm, unless un-lodged and properly repositioned. It is sandwiched in, and may also envelop, firearm structure. Upper surface (154) of hammer strut support may also have a guide channel (164) to align hammer strut (116).

A firearm operating system includes a housing, a central pivoting member disposed within the housing, a trigger including a portion disposed within the housing and a portion extending outside the housing such that the portion of the trigger within the housing includes a hole and at least one finger that extends in a first direction from the hole. Due to movement of the trigger, the at least one finger presses against the central pivoting member to cause the central pivoting member to rotate.

A firearm operating system includes a housing, a central pivoting member disposed within the housing, a trigger including a portion disposed within the housing and a portion extending outside the housing such that the portion of the trigger within the housing includes a hole and at least one finger that extends in a first direction from the hole. Due to movement of the trigger, the at least one finger presses against the central pivoting member to cause the central pivoting member to rotate.

A hammer strut support (150, 156, 160, 162, 166) in a firearm which supports or aligns a free end (134) of a pivotally mounted hammer strut (116), and physically blocks it from becoming lodged in a position, typically under a crosspin (120) such as a sear spring stop pin, that would preclude subsequent proper reassembly of firearm, unless un-lodged and properly repositioned. It is sandwiched in, and may also envelop, firearm structure. Upper surface (154) of hammer strut support may also have a guide channel (164) to align hammer strut (116).

Implementations of the present invention relate to apparatuses, systems, and methods for firing a belt-fed closed-bolt firearm by delivering an impulse from an impulse source along a first axis to a firing pin on a second axis. The first axis and second axis are not coaxial, allowing the impulse source to be disposed away from and not in direct contact or alignment with the firing pin.

Implementations of the present invention relate to apparatuses, systems, and methods for firing a belt-fed closed-bolt firearm by delivering an impulse from an impulse source along a first axis to a firing pin on a second axis. The first axis and second axis are not coaxial, allowing the impulse source to be disposed away from and not in direct contact or alignment with the firing pin.

An operating system for a firearm includes a trigger, a hammer, a disconnector, a pivoting arm, and a lower member. The trigger includes a lower portion, an upper portion, and a trigger pivot. The disconnector includes a lower portion, an upper portion, and a disconnector pivot. The pivoting arm includes a forward protrusion, a pivoting arm opening, and a pin extending through the pivoting arm opening. The lower member includes a lower member opening and a pin hole that is coaxial with the trigger pivot and the disconnector pivot. At least a portion of the trigger and at least a portion of the disconnector are disposed within the lower member opening. Motion of the trigger causes the forward protrusion of the pivoting arm to engage a bolt carrier group and hold the bolt carrier group in an open position.

An operating system for a firearm includes a trigger, a hammer, a disconnector, a pivoting arm, and a lower member. The trigger includes a lower portion, an upper portion, and a trigger pivot. The disconnector includes a lower portion, an upper portion, and a disconnector pivot. The pivoting arm includes a forward protrusion, a pivoting arm opening, and a pin extending through the pivoting arm opening. The lower member includes a lower member opening and a pin hole that is coaxial with the trigger pivot and the disconnector pivot. At least a portion of the trigger and at least a portion of the disconnector are disposed within the lower member opening. Motion of the trigger causes the forward protrusion of the pivoting arm to engage a bolt carrier group and hold the bolt carrier group in an open position.

A firearm operating system includes a housing, a central pivoting member disposed within the housing, a trigger including a portion disposed within the housing and a portion extending outside the housing such that the portion of the trigger within the housing includes a hole and at least one finger that extends in a first direction from the hole. Due to movement of the trigger, the at least one finger presses against the central pivoting member to cause the central pivoting member to rotate.

A firearm operating system includes a housing, a central pivoting member disposed within the housing, a trigger including a portion disposed within the housing and a portion extending outside the housing such that the portion of the trigger within the housing includes a hole and at least one finger that extends in a first direction from the hole. Due to movement of the trigger, the at least one finger presses against the central pivoting member to cause the central pivoting member to rotate.