Home / Accessory-Silencer Accessories / Gemtech ADAPTER UMAREX RIFLES View cart “Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28” has been added to your cart. Sale! Gemtech ADAPTER UMAREX RIFLES$4500 Original price was: $4500.$4183Current price is: $4183. Out of stock SKU: 12211 Category: Accessory-Silencer Accessories Product ID: 26747 Description Description M8X.75 to 1/2-28 Adapter Related products Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH $7495 Original price was: $7495.$7135Current price is: $7135. Sale! Dead Air Armament HUB DIRECT THRD MNT M18X1.5 AI $8900 Original price was: $8900.$8351Current price is: $8351. Gemtech ADAPTER S&W M&P22C/22LR $6200 Sale! Rugged Suppressors R3 FLASH HIDER 3/4X24 $10000 Original price was: $10000.$8715Current price is: $8715.