The NcStar Detachable Rear A2 Backup Iron Sight (brand part number MARDRS) is a dual-aperture rear sight built for AR-15 platform rifles, precision-made from aluminum and steel. NCStar builds it around the fixed A2 sighting design shooters already know, with full windage and elevation adjustment so you can dial in a true zero rather than rely on a fixed reference point. It detaches and mounts onto both Weaver and Picatinny-type rails, making it a practical backup sight behind a primary red dot or as a standalone iron sight setup. Finished in black, it’s a durable, no-frills way to add a reliable rear sight to any AR-15 build.

Key Specifications

• Uses a dual-aperture A2-style rear sight design.
• Fully adjustable for windage and elevation.
• Mounts to both Weaver and Picatinny-type rails.
• Precision-made from aluminum and steel.
• Detachable design for use as a backup behind a primary optic.
• Finished in black.
• Purpose-built for the AR-15 platform.

Frequently Asked Questions

Can I adjust this sight for zero? Yes, it offers full windage and elevation adjustment.

What rails does this fit? Both Weaver and Picatinny-type rails.

Can I use this as a backup behind a red dot? Yes, it’s a detachable design built for exactly that use.

Buy the NcStar Detachable Rear A2 Backup Iron Sight for AR-15 – Dual Aperture

Add a reliable, adjustable rear sight behind your primary optic. Order it from our NCStar lineup, part of our gun sights selection, at our Lubbock, Texas gun shop for fast, direct shipping.