Home / Accessory-Parts / B&T USW-G20 CONVERSION KIT G20/21 You cannot add "POF USA DICTATOR GAS BLOCK MID 308 #" to the cart because the product is out of stock. 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 Trijicon LENS PEN CLEANER/BRUSH $1800 Sale! Christensen Arms DBM BOTTOM METAL SA TACTICAL $26999 $23825 Wilson Combat BUSHING WRENCH 1911 FS/CPCT BL $395 Trijicon SRO REPLACEMENT BATTERY CAP $3200