This is a Griffin Armament Piston known as the Piston, model DAPUNIVERSAL.
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.
Features:
Patented CAM-LOK™ (Covert Application Mount - Locking) universal QD piston attachment system
3 mounting positions, 120 degrees separated for rapid mounting
Internal taper surface locks in place with interfacing barrel adapters and drastically reduces or eliminates common baffle/end cap strikes
Compatible with Universal QD pistons barrel adapters (sold separately)
Total system weight is identical to legacy direct thread pistons
H900 heat treated for improved durability and wear resistance
17-4 stainless steel material