Home / Accessory-Parts / B&T USW-G20 CONVERSION KIT G20/21 View cart “Wilson Combat GAS TUBE AR-15 SS 11.75″” has been added to your cart. Sale! B&T USW-G20 CONVERSION KIT G20/21$57500 Original price was: $57500.$45707Current price is: $45707. Out of stock SKU: BT-430220 Category: Accessory-Parts Product ID: 26294 Description Description Compatible with Glock 20/21Aimpoint ACRO InterfacePicatinny Rail with Screw Related products Wilson Combat GRIP MODULE WCP320 CRRY TAN MS $6795 Wilson Combat BUSHING WRENCH 1911 FS/CPCT BL $395 Wilson Combat GAS TUBE PISTOL LENGTH 6.6″ $1350 POF USA TOMAHAWK CHARGING HANDLE 308 $10400