Magpul The MBUS (Magpul® Back-Up Sight) is an affordable, collapsible front sight. The front sight is produced by pressure injection of polymer. The MBUS front sight is height adjustable and fits most Picatinny 1913/Weaver rail handguards, but is specifically tailored to the AR15 / M16 platform.
A height adjustment tool is included, but most A2 front sight adjustment tools can also be used.
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