AR-15 Adjustable Rear Sight
The AR-15 Adjustable Rear Sight is an A2-style detachable iron sight built for AR-15, M4, and M16 flattop upper receivers. Constructed from aircraft-grade aluminum with steel hardware, it features dual apertures, fully adjustable windage and elevation, and a large steel thumb nut that locks securely to any Picatinny rail. The compact 2.7-inch footprint leaves plenty of rail space to co-witness behind a red dot, reflex, or holographic optic. A solid choice for shooters who want a dependable back-up iron sight on a flattop AR build.
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- SKU
- MARDRS
$37.13
Description
Features
- A2-Style Detachable Rear Sight — Classic A2 back-up iron sight profile designed for AR-15, M4, and M16 flattop upper receivers.
- Dual Aperture Assembly — Flip between a large aperture for close-range engagements and a small aperture for precision shots at distance.
- Fully Adjustable Windage and Elevation — Knurled click-adjustable knobs let you dial in a true zero and track adjustments by feel.
- Picatinny Rail Mount — Integrated clamp fits virtually any Mil-Spec 1913 flattop upper receiver without tools.
- Steel Thumb Nut and Rail Clamp — Oversized steel thumb nut delivers a positive, repeatable lock-up that holds zero under recoil.
- Aluminum and Steel Construction — Aircraft-grade aluminum body paired with steel hardware keeps weight down without sacrificing durability.
- Matte Black Finish — Non-reflective matte coating reduces glare and matches standard AR furniture.
- Compact Footprint — Short 2.7-inch profile leaves room on the rail for a primary red dot, reflex, or holographic optic to co-witness behind.
- Tool-Free Install and Removal — Hand-tighten the thumb nut to mount or pull the sight on the fly with no Allen keys required.
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Customer Reviews
Top customer reviews
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Old school A2 rear, no batteries neededCall me a fudd but I still believe every AR needs a proper A2 rear sight on it. This one is solid the dual aperture flips between the small and large peep just like the carry handle sight and the windage and elevation adjustments are crisp with no slop. Mounted it on the rear of my flat top BCM upper and co-witnessed it with my Aimpoint PRO. Zeroed at 50 yards in about 6 rounds and the clicks tracked perfectly. The all metal construction feels way more substantial than the polymer flip ups I see people running and for $30 its cheaper than most of them too. Ive got about 800 rounds on this setup now and it hasnt budged.
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Backup sight, quality design, arrived super quickGot this backup sight in like 2 days which was insanely fast. The NcSTAR MARDRS is a solid detachable rear iron sight for your AR-15 rail system. The dual aperture design lets you shoot close range or long range depending on what you need. Already mounted it on my rifle and the windage and elevation adjustments work smoothly.
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