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The MBUS (Magpul Back-Up Sight) is a folding die-cast sight. The MBUS front sight is height adjustable and fits most weapons with a standard Picatinny rail, but is specially adapted for the AR15/M16 platform.
The polymer construction of the front sight provides light weight and resistance to operational loads.
The spring-loaded sight is easily activated from either side or by pressing from above. Protective wings shield the spring-locking front sight post. The detent and spring pressure keep the front sight upright but allow it to fold unhindered on impact.
Compatible with most MIL-STD-1913 Picatinny / STANAG 4694* rail stocks and provides the same bore height as standard sights.
A height adjustment tool is included, but most non-original front sight adjustment tools can also 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 forend on the same plane as the receiver rail. Because of this the sight is also not compatible with MOE Hand Guards.
Characteristics
Mount: Picatinny rail, STANAG 4694
Vertical adjustment:
~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
Height above rail, stowed: 0.51 in
Material: polymer
Length, deployed: 1.5 in
Length, stowed: 2.6 in
Weight: 1.2 oz