Home / Accessory-Silencer Accessories / Gemtech PISTON GM-45 LID MK23 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 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 THREAD PROTECTOR 1/2-28 RF $1800 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH $7495 Original price was: $7495.$7135Current price is: $7135. Dead Air Armament SIG MOSQUITO THRD ADAPT 1/2X28 $4500 Sale! Dead Air Armament WOLVERINE INSERT 15MM RH HK $8900 Original price was: $8900.$7865Current price is: $7865.