The Griffin Armament CAM-LOK Piston Barrel Adapter with .578x28 threading provides a faster and more secure mounting solution for suppressors on browning style action (tilt barrel) pistols compared to legacy direct thread systems.Griffin Armament CAM-LOK Piston Barrel Adapter .578x28CAM-LOK(TM) (Covert Application Mount - Locking) Patented Universal QD piston attachment system3 mounting positions 120 degrees separated for rapid mountingForward taper surface locks in place and reduces baffle/end cap strikesCoarse threads are top cut for increased durability and wear resistance3/4" or 19mm wrench pattern for secure installationCompatible with Universal QD pistons (sold separately)QPQ Nitride finish for durable black finishDesigned specifically for browning style action pistols this adapter system provides rapid secure attachment while maintaining identical weight to legacy direct thread pistons and reducing side concussion compared to blind muzzle designs.