Home / Accessory-Parts / B&T USW-G20 CONVERSION KIT G20/21 View cart “Wilson Combat GAS BLOCK AR15 LO-PRO .875″” has been added to your cart. Sale! B&T USW-G20 CONVERSION KIT G20/21$57500 $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 GAS TUBE AR-15 SS 9.75″ $1395 Wilson Combat GRIP MOD WCP320 CARRY BLK $6795 ProMag AR-15/M16 MAGWELL VICE BLOCK $1599 Sale! POF USA DICTATOR GAS BLOCK MIDLENGTH $16300 $16234