Home / Accessory-Silencer Accessories / Gemtech PISTON GM-45 LID USP You cannot add "SIG SAUER MUZZLE BRK CL 7.62MM 25 DEG" to the cart because the product is out of stock. Gemtech PISTON GM-45 LID USP$14800 Out of stock SKU: 12191 Category: Accessory-Silencer Accessories Product ID: 26717 Description Description GM-45/Blackside PistonFits HK USP 45 Pistols Related products Gemtech GM9 THREAD REAR MOUNT M18X1RH $9100 Gemtech THREAD PROTECTOR 1/2-28 RF $1800 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 $7495 $7135 Sale! Rugged Suppressors R3 FLASH HIDER M18X1 $10000 $8715