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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 most 1913 Picatinny-railed hand guards.
An elevation adjustment tool is included, but most aftermarket A2 front sight adjustment tools may be used as well.
Made in the USA.
Height above rail, stowed: ~0.51 in.
Length, deployed: 1.5 in.
Length, stowed: 2.6 in.
Weight, w/ hardware: 1.2 oz.
~1.6 MOA (1.886"/100m) per click with a 14.5" sight radius
~1.2 MOA (1.367"/100m) per click with a 20" sight radius
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.