The Magpul MBUS Pro (Magpul Back-Up Sight) Rear Sight (brand part number MAG276-BLK) is a corrosion-resistant, all-steel back-up sighting solution built to deliver maximum functionality and strength in a package smaller than its price and size suggest. Magpul case-hardens the sight and finishes it with Melonite QPQ for extreme resistance to wear and corrosion. It’s windage adjustable via a low-profile knob with no tools required, and positive detents hold the sight at standard AR sight height when deployed and low enough when stowed that it stays out of the way until needed. At a 14.5-inch sight radius, adjustment runs 0.5 MOA (0.566 inch per 100 meters) per click; at a 20-inch sight radius, it runs 0.4 MOA (0.410 inch per 100 meters) per click. The small aperture measures 0.07 inch in diameter and the large aperture measures 0.19 inch. It’s made in the USA.

Key Specifications

• Built as a flip-up, folding rear sight.
• All-steel construction is case-hardened for strength.
• Finished with Melonite QPQ for wear and corrosion resistance.
• Windage adjustable via a low-profile knob, no tools required.
• Small aperture measures 0.07 inch in diameter.
• Large aperture measures 0.19 inch in diameter.
• Adjusts 0.5 MOA per click at a 14.5-inch sight radius.
• Adjusts 0.4 MOA per click at a 20-inch sight radius.
• Uses positive detents to hold zero when deployed or stowed.
• Made in the USA.

Frequently Asked Questions

Do I need tools to adjust windage? No, it adjusts via a low-profile knob with no tools required.

How much does each click adjust? 0.5 MOA per click at a 14.5-inch sight radius, or 0.4 MOA per click at a 20-inch sight radius.

Does it stay zeroed when folded down? Yes, positive detents hold the sight securely whether it’s deployed or stowed.

Buy the Magpul MBUS Pro Rear Sight, QPQ Melonited Steel, for AR Platform

Add a durable, no-tools back-up sight to your AR build. Order the Magpul MBUS Pro from our gun sights selection at our Lubbock, Texas gun shop for fast, direct shipping.