XTS-A2 FRONT SIGHT GAS BLOCK by Xtreme Tactical Sports $16.95 Base - $16.95 Taper Pin - $16.95 Set Screw - $16.95 Base Taper Pin Set Screw Mount Type 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart XTS-A2 FRONT SIGHT GAS BLOCK .750 Diameter Available Mounting Options: Taper Pin, Set Screw or Base (no mounting holes)