Home / Accessory-Silencer Accessories / Gemtech PISTON GM-45 LID USP View cart “SIG SAUER FLASH HIDER CL 5.56MM 90 DEG” has been added to your cart. 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 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 40SW 9/16X24 $7495 $7135 Sale! SIG SAUER FLASH HIDER CL 5.56MM 90 DEG $17999 $16957 Gemtech ADAPTER MM9 FTM 1/2-28 $7500 Gemtech GM9 THREAD REAR MOUNT M18X1RH $9100