Home / Accessory-Silencer Accessories / Gemtech PISTON GM-45 LID USP View cart “SilencerCo 3-LUG MUZZLE DEVICE 9MM 1/2X36” has been added to your cart. Gemtech PISTON GM-45 LID USP$14800 In stock Gemtech PISTON GM-45 LID USP quantity Add to cart SKU: 12191 Category: Accessory-Silencer Accessories Product ID: 26717 Description Description GM-45/Blackside PistonFits HK USP 45 Pistols Related products Sale! Rugged Suppressors FLASH HIDER FRONT CAP 5.56 $10000 Original price was: $10000.$8715Current price is: $8715. Gemtech ADAPTER MM9 FTM 1/2-28 $7500 SilencerCo O-RING BOOSTER PACK $900 Sale! Rugged Suppressors OBSIDIAN PISTON .578X28 $8000 Original price was: $8000.$7196Current price is: $7196.