The Magpul MBUS Flip-Up Rear Sight (Magpul part no. MAG248-BLK) is a color injection-molded back-up sight built to fold flat out of the way until it’s needed. The dual-aperture rear sight adjusts for windage and mounts to any 1913 Picatinny rail, though it’s tailored specifically to the AR-15 and M16 platform. Magpul designed the MBUS as a low-cost, durable alternative to a metal folding sight, giving shooters a reliable backup if a red dot or optic ever fails. It’s a popular addition for anyone running a primary optic who wants a genuine, field-tested backup sighting system in reserve.

Key Specifications

• Features a dual-aperture rear sight for close and long-range aiming references.
• Adjustable for windage to fine-tune point of impact.
• Folds into a low-profile flip-up design when not in use.
• Mounts to any 1913 Picatinny rail, with a fit tailored to AR-15/M16 platforms.
• Weighs a light 0.12 lb, adding negligible weight to a rail.

Frequently Asked Questions

What rifles does this sight fit? It mounts to any 1913 Picatinny rail and is tailored specifically to the AR-15/M16 platform.

Can this sight be adjusted? Yes, the rear aperture is adjustable for windage.

Buy the Magpul MBUS Flip-Up Rear Sight, Black

Add a dependable backup sight behind a primary optic with the Magpul MBUS. Browse our full gun sights selection and order from our Lubbock, Texas gun shop for fast, direct shipping.