Magpul Mbus Back-up Front Sight, FDE
The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits all mil-spec 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16/M4 platform. NOTE: Cannot be mounted to a railed gas block due to excess heat issues. Front MBUS must be mounted to a railed fore end on the same plane as the receiver rail. Made in U.S.A. Flat Dark Earth (Tan) in color.