The Magpul MBUS flip-up rear sight in black (Magpul part no. MAG248-BLK) is a polymer backup sight designed to pair with the MBUS front sight on an AR-15 or M16 pattern rifle. It attaches to an M1913 Picatinny rail, folds to just 0.51 inch tall, and pops up at standard AR sight height when you push the button. The dual-aperture rotating window and tool-less windage wheel let you adjust the sight quickly in the field. Wings on both sides protect the aperture, and the impact-resistant polymer keeps weight to 1.3 ounces.

Key Specifications

• Position is rear, designed to pair with the MBUS front sight.
• The platform is AR-15/M16, where the sight is specifically tailored to fit.
• It attaches to M1913 Picatinny rails.
• Folded, it stows only 0.51 inch above the rail, keeping the backup out of sight.
• Deployed, the center of the aperture sits 1.42 inches above the rail, standard AR sight height.
• Deployment is spring-loaded and triggered by pushing a button for quick pop-up.
• The rotating dual aperture gives a wide window for close or low-light shots and a narrow one for distance.
• A tool-less windage wheel adjusts about 0.7 MOA per click on a 14.5 inch sight radius.
• Detents secure the sight, windage and aperture settings during hard use.
• Weight with hardware is 1.3 ounces, in impact-resistant polymer.

Frequently Asked Questions

What rifles is the MBUS rear sight made for? Magpul tailors it for the AR-15/M16 platform, and it attaches to M1913 Picatinny rails.

How do I adjust windage? Windage is tool-less through a wheel. Each click moves about 0.7 MOA with a 14.5 inch sight radius, or about 0.5 MOA with a 20 inch radius.

How tall is it when folded? The stowed height is about 0.51 inch, and when deployed the center of the aperture sits 1.42 inches above the rail.

Buy the Magpul MBUS Flip-Up Rear Sight, Black

Every optic-equipped rifle should have a backup that works without batteries, and the MBUS rear sight is a light, folding answer. Pair it with the MBUS front sight and you have a complete flip-up set that stays out of the way until needed. Order it from our Lubbock, Texas gun shop for fast shipping, and browse more gun sights while you are here.