The new MBUS (Magpul Back-Up Sight) GEN 2 is a low-cost, color injection molded, folding back-up sight. The MBUS Front Sight is adjustable for elevation and fits most Picatinny-railed hand guard equipped weapons, but is specifically tailored to the AR15/M16/M4 platform. Made in U.S.A. Features * Impact resistant polymer construction provides light weight and resists operational abuse * Spring-loaded flip up sight easily activated from either side or by pressing the top * Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc. * Clamps to most any MIL-STD-1913 Picatinny/STANAG 4694 railed hand guard and provides the same height-over-bore as standard A2 irons * Protective wings shield the spring-locking A2 front sight post Specifications * MBUS – Front Gen 2 o Weight, w/ hardware: 1.2 oz. o Height above rail, stowed: ~0.51 in. o Length, stowed: 2.6 in. o Length, deployed: 1.5 in. NEW Features for GEN 2 * Reduced size for greater optics compatibility * Spring-locking front sight post holds consistent elevation 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. Because of this the sight is not compatible with the MOE Hand Guard.