A locking firearm silencer mount or firearm muzzle accessory mount improvement system and method. The coupling device provides an internal thread and sealing taper, as well as an actively sprung locking collar with one or more locking positions. The muzzle device provides a thread and sealing taper operatively associated to the mount socket. The threads on the mount and muzzle accessory effectuate mating between the locking mount and the firearm muzzle accessory in a single axial orientation.