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.

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 any standard mil-spec 1913 Picatinny railed hand guard and provides the same height-over-bore as standard A2 irons
Protective wings shield the standard A2 front sight post