Magpul MBUS Rear Sight, FDE

The MBUS (MagpulA(R) Back-Up Sight) is a low-cost, color injection molded, folding back-up sight. The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15 / M16 platform.Spring-Loaded Flip Up Sight: Spring-loaded flip up sight easily activated from either side or by pressing the top; protective wings shield the dual, same plane flip aperatures; sight can still be folded with either large or small aperture in position; detent knob easily and positively adjusts windageImpact-Resistant Polymer Construction: Polymer construction provides light weight and resists operational abuseDetent and Spring Pressure Keeps Sight Erect: Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etcClamps to Most MIL-STD-1913 Picatinny Rails: Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 ironsSpecifications:Position: RearHeight Above Rail, Stowed: 0.51"Length, Deployed: 1.5"Length, Stowed: 2.6"Weight, w/ Hardware: 1.3ozOther: Center of aperture to top of rail: 1.42"Windage Adjustment:0.7 MOA per click with 14.5" sight radius0.5 MOA per click with 20" sight radius