The Griffin Armament CAM-LOK (Covert Application Mount - Locking) Universal piston system Barrel Adapter is made from 17-4 stainless steel and has a QPQ Nitride black finish. Compatible with Universal QD pistons (sold separately).
*NOTE*: "1/2x28 special" is intended for compact 9mm pistols which generally have smaller outside diameter barrels and thus no typical thread shoulder. Examples are : Sig P365, Glock 43. Glock 48... etc. Users with mid to full size handguns should choose the standard "1/2x28" size
Threads: 1/2x28 (standard)