Griffin Armament, Barrel Adapter, CAM-LOK, 13.5X1LH WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. CAM-LOK(TM) (Covert Application Mount - Locking) Patented Universal QD piston attachment system 3 mounting positions, 120 degrees separated for rapid mounting Forward taper surface locks in place with interfacing piston and drastically reduces or eliminates common baffle/end cap strikes Coarse threads are top cut to increase durability and wear resistance 3/4"or 19mm wrench pattern accommodates socket wrench for secure and easy installation Compatible with Universal QD pistons (sold separately) Internal bore reduces side concussion and visual disturbance vs blind muzzle Total system weight is identical to legacy direct thread pistons QPQ Nitride finish for attractive, durable black finish 17-4 stainless steel material Also supports Universal Carry Comp The Griffin Armament CAM-LOK(TM) interface affords the user the ability to convert the suppressor to a much faster and more secure mounting solution on browning style action (tilt barrel) pistols vs it's legacy technology, single piece, direct thread piston counterparts. This system provides a rapid, secure attachment to the host pistol.