Magpul MBUS Pro Rear Folding Sight

The Magpul MBUS Pro Rear is an all-steel dual-aperture folding backup iron sight for AR-15 and M4 rifles, clamping to any 1913 Picatinny top rail.

A steel rear sight with dual apertures and tool-less windage — the MBUS Pro Rear completes a backup system you can actually rely on.

The Magpul MBUS Pro Rear Sight (MAG276) brings all-steel construction to the rear half of your iron-sight equation. The dual-aperture design flips between a large ring for fast, close work and a small aperture for precision at distance — the classic combat configuration, executed with machined precision. Windage adjusts tool-lessly with positive, audible clicks, so refining zero at the range needs nothing but your fingers.

Folded, the sight sits extraordinarily low and snag-free; deployed, it locks up without play and returns to zero shot after shot. Paired with an MBUS Pro front, you get a sighting system tough enough to serve as primary irons on a dedicated build — and dependable enough to bet on when an optic goes down.

Why shooters choose the MBUS Pro Rear

• All-steel construction — built to take what polymer cannot
• Dual apertures — fast ring up close, fine aperture at distance
• Tool-less windage adjustment — crisp, positive clicks
• Ultra-low folded profile — clean under optics, snag-free
• True return to zero — deployment after deployment

What the MBUS Pro Rear fits

Fits 1913 Picatinny top rails on AR-15/M4 pattern rifles, at the rear of the receiver rail in the usual backup sight position. Make sure there is clear rail behind your optic or mount before ordering, and that the front and rear sit on the same rail plane. It pairs with any MBUS Pro front sight; elevation is normally set on the front sight, so zero the pair together.

Specifications

Finish the system properly. Order the MBUS Pro Rear today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.

Explore more: Iron Sights & Backup Sights, AR-15 Parts or browse all Magpul.