Abstract: A bolt for a firearm includes, among other things, a bolt body extending between a first bolt end and a second bolt end, the bolt body defining a shaped cavity adjacent to a breech lock recess. The shaped cavity is defined by a cavity floor extending between a forward cavity face and a rear cavity face, the forward cavity face defines a forward angle relative to the cavity floor, the rear cavity face defines a rear angle relative to the cavity floor, and each of the forward angle and the rear angle is acute. A bolt assembly for a firearm and a method of fabricating a bolt for a firearm are also disclosed.

Abstract: A bolt for a firearm includes, among other things, a bolt body extending between a first bolt end and a second bolt end, the bolt body defining a shaped cavity adjacent to a breech lock recess. The shaped cavity is defined by a cavity floor extending between a forward cavity face and a rear cavity face, the forward cavity face defines a forward angle relative to the cavity floor, the rear cavity face defines a rear angle relative to the cavity floor, and each of the forward angle and the rear angle is acute. A bolt assembly for a firearm and a method of fabricating a bolt for a firearm are also disclosed.

Abstract: An insert for a gun bolt according to an example of the present disclosure includes, among other things, a gun lock interface insert sized to be fixedly secured in a gun bolt. The gun lock interface insert includes a first guide structure and a second guide structure extending from a main body. The main body defines a first engagement surface and a second engagement surface. The first engagement and second engagement surfaces space apart the first guide and second guide structures. Each of the first engagement and second engagement surfaces is configured to selectively engage a breech lock. A method of repairing a bolt assembly is also disclosed.

Abstract: An insert for a gun bolt according to an example of the present disclosure includes, among other things, a gun lock interface insert sized to be fixedly secured in a gun bolt. The gun lock interface insert includes a first guide structure and a second guide structure extending from a main body. The main body defines a first engagement surface and a second engagement surface. The first engagement and second engagement surfaces space apart the first guide and second guide structures. Each of the first engagement and second engagement surfaces is configured to selectively engage a breech lock. A method of repairing a bolt assembly is also disclosed.

Abstract: A bolt assembly for a machine gun according to an exemplary aspect of the present disclosure includes, among other things, a lock interface insert configured to be insertable into a bolt. The lock interface insert includes a main body defining a first engagement surface and a second engagement surface. At least one of the first and second engagement surfaces is configured to selectively engage a portion of a breech lock.