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This is a Magpul MBUS Pro Rear Steel Folding Sight Black. The MBUS Pro is a corrosion resistant all-steel back-up sighting solution that delivers maximum functionality and strength with minimum bulk at a price that's even smaller than its size. The dual aperture, windage adjustable Rear and no-tool, elevation adjustable Front excel in all 1913 Picatinny rail mounting applications, including rail-height gas blocks. Positive detents keep the MBUS PRO Front and Rear at standard AR sight height when deployed, and so low when they are stowed that you'll never notice them until they're needed. Narrow width Front is compatible with most IR aiming laser and light installations for the professional user.
All steel construction
Case hardened and finished with a ferritic nitrocarburizing process for extreme resistance to wear and corrosion
Mounts on any MIL-STD-1913 Picatinny/STANAG 4694 rail
Windage adjustable with low-profile knob – no tools required
Positive detents in both the up and down positions
Standard AR sight height when deployed
MBUS Pro – Rear
Weight, w/ hardware: 1.80 oz.
Height above rail, stowed, at mid-point: ~0.37"
Length, stowed: 2.1"
Aperture height over rail: 1.41"
Small aperture dia.: 0.07"
Large aperture dia.: 0.19"
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