Abstract: A firearm booster assembly is described that includes a mounting piston, a main housing comprising a housing interior and optionally a locking cap removably attached to the mounting piston. The mounting piston and locking cap may be at least partially located in the housing interior. The housing exterior may include threads removably attaching the booster assembly to a suppressor or other barrel accessory and the mounting piston may include threads attaching the booster assembly to a barrel of a pistol or other firearm. The housing interior preferably includes at least one O-ring or other seal and the housing exterior preferably includes no holes leading to the housing interior. Upon attachment of the booster assembly to a suppressor and pistol and firing the pistol, the main housing preferably moves forwardly relative to the mounting piston.

Abstract: A firearm barrel accessory that quick connects and disconnects to a firearm barrel by rotating is described. The accessory may be a firearm suppressor with a silencer barrel, a mount retention ring located inside the silencer barrel that includes longitudinal grooves that lead to circumferential grooves that have a first radial side and a second radial side. The firearm barrel is attached to a muzzle break that may include a plurality of lugs that fit into longitudinal grooves. After placement in the longitudinal grooves, the silencer barrel and mount retention ring are rotated/twisted about the silencer barrel longitudinal axis so that the circumferential grooves move relative to the lugs until the lugs contact the second radial side, at which point the mount retention ring ceases to rotate while the silencer barrel continues to rotate. A ratchet retention ring may exert tension on the mount retention ring in the rearward direction.