XTS MICRO-GB STEEL MICRO GAS BLOCK FOR AR-15 by Xtreme Tactical Sports $11.50 Silver - $11.50 Black - $6.00 Silver Black Color 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart XTS MICRO-GB STEEL MICRO GAS BLOCK FOR AR-15 Steel Construction .750 Diameter Available in black & silver