The MBUS (Magpul Back-Up Sight) is a low-cost, polymer, color injection
molded folding back-up sight. The MBUS Front Sight is adjustable for
elevation and fits most 1913 Picatinny-railed hand guards, but is
specifically tailored to the AR15/M16 platform.Features- 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 and protective wings shield the
spring-locking A2 front sight post. Includes elevation adjustment tool,
but most aftermarket A2 front sight adjustment tools may be used.
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 also not compatible with
MOE Hand Guards.