UTAC ALUMINUM Anodized Black Matte 0.75\" Diameter Quad Picatinny Rail Gas Block for AR15 AR-15 M4 M16 Rifle
Price 44.99 USD
Fits 0.75" Regular Barrel and Standard Gas Tube * Replaces A2 Front Sight and Provides 4 Picatinny Rails * Precision Machined * Inner Dia.:19mm(0.75") * Hard Anodizing Black Matte Finish