XTS GB625 LOW PROFILE STEEL GAS BLOCK .625 by Xtreme Tactical Sports $12.85 Silver - $12.85 Black - $9.95 Silver Black Color 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart XTS GB625 LOW PROFILE STEEL GAS BLOCK .625 Steel Construction .625 Diameter Available in Silver & Black