Firearm compensator assembly

A firearm compensator assembly comprises:

• a cylindrical-shaped compensator body defining a bore and an axis, the bore having a muzzle end portion and a breech end portion, the body including
• a sidewall,
• a contact surface,
• an outer surface, and
• at least one gas discharge port extending through the sidewall between the bore and the outer surface;
• a compensator base adapted to be mounted to a barrel of a firearm, the base including a flange segment disposed within the body bore breech end portion, the flange segment having a face defining a base contact surface, and
• a tubular sleeve segment extending rearwardly from the flange segment;
• a washer-shaped lock bushing disposed around the compensator base tubular sleeve segment;
• a plurality of fasteners mounting the lock bushing to the body sidewall;
• and
• a spring disposed around the compensator base tubular sleeve segment intermediate the lock bushing and the base flange segment, the spring exerting a biasing force urging the body contact surface into engagement with the base contact surface whereby the body is locked to the base;
• wherein the gas discharge port is rotatable around the axis by urging the body contact surface away from the base contact surface against the biasing force of the spring.

A muzzle device for a firearm having a barrel defining a bore, the muzzle device comprising:

• a base having a threaded surface adapted to be mounted on the barrel;
• the base defining a base bore registered with the barrel bore when the mounting facility is mounted on the barrel;
• a body rotatably mounted to the base and defining a body bore;
• the body bore registered with the base bore;
• the body rotatable with respect to the base about a rotation axis defined by the bore of the barrel;
• the body defining a gas discharge port communicating with the body bore and extending away from the bore;
• and
• the base and the body engaging each other with a detent mechanism having a plurality of stable positions, each stable position being a different angular position of the body with respect to the base.