Building on the success of the MBUS polymer sights, Magpul is proud to introduce the MBUS PRO. With many of the same benefits of the original MBUS, the MBUS PRO are constructed from steel and fold much flatter. The rear sight features a finger adjustable windage knob, and slim, low profile design. 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. Features Steel construction; Windage adjustable; Tool free adjustments; Model - MBUS PRO; Type - Sight; Fit - Picatinny; Finish/Color - Black; Rear; Item Weight - 0.19 lbs.; .