Home / Accessory-Silencer Accessories / Gemtech PISTON GM-45 LID MK23 View cart “SilencerCo O-RING BOOSTER PACK” has been added to your cart. Gemtech PISTON GM-45 LID MK23$14800 Out of stock SKU: 12190 Category: Accessory-Silencer Accessories Product ID: 26720 Description Description GM-45/Blackside PistonFits HK Mk 23 Pistols Related products Gemtech ADAPTER S&W M&P22C/22LR $6200 Sale! Dead Air Armament WOLVERINE INSERT 15MM RH HK $8900 $7865 SilencerCo O-RING BOOSTER PACK $900 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 $7495 $7135