Home / Accessory-Parts / B&T USW-G20 CONVERSION KIT G20/21 View cart “Wilson Combat GAS TUBE AR-15 SS 9.75″” 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 Daniel Defense PICATINNY RAIL PANEL SET BLK $3100 Wilson Combat GAS TUBE AR-15 SS 11.75″ $1795 Wilson Combat GRIP MOD WCP320 CARRY BLK $6795 Wilson Combat EJECTION PORT DUST COVER KIT $295