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.Made in the usa.*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 also not compatible with moe hand guards.Type: FrontFrame Material: PolymerFrame Color: OD GreenFirearm Fit: AR15/M16Base Configuration: Picatinny RailStyle: FoldingElevation Adjustment: 1.60 MOAFirearm Type: AR-Platform