Magpul MBUS Rear Sight | Black

Magpul MBUS Rear Sight | Black

The Magpul MBUS Rear Sight in Black is a folding back-up sight built for M1913 Picatinny rail systems and tailored for AR-15/M16 platform use. This MAG248-BLK rear sight gives builders a lightweight polymer rear sight option with spring-loaded deployment, dual-aperture capability, and tool-less windage adjustment in a compact, low-profile package.

Magpul constructs the MBUS Rear Sight from impact-resistant polymer to keep weight down while maintaining practical durability for range, training, and general-purpose rifle configurations. When stowed, the sight sits at approximately 0.51″ above the rail, helping keep the rear sight unobtrusive behind an optic or on a streamlined upper receiver setup.

The spring-loaded design deploys by pressing the release latch, allowing the sight arm to snap into position when needed. Detents help secure the sight, windage, and aperture settings, while protective side wings help shield the rear aperture assembly from incidental contact during handling and storage.

A rotating dual-aperture window provides wide and narrow aperture options. The larger aperture supports closer-range or low-light sighting needs, while the smaller aperture supports more precise alignment at longer distances. The deployed sight places the center of the aperture 1.42″ above the rail, matching standard AR sight height.

Windage adjustment is handled with a side-mounted wheel, allowing tool-less left-right point-of-impact correction. Adjustment values at approximately 0.7 MOA per click with a 14.5″ sight radius and approximately 0.5 MOA per click with a 20″ sight radius, giving the rear MBUS practical adjustability across common AR-15 sight-radius configurations.

• Manufacturer: Magpul
• Color: Black
• Position: Rear
• Mounting: M1913 Picatinny rail
• Platform Fit: Specifically tailored for AR-15/M16 platforms
• Construction: Impact-resistant polymer
• Stowed Height: Approximately 0.51″
• Length Deployed: 1.5″
• Length Stowed: 2.6″
• Weight with Hardware: 1.3 oz.
• Aperture Height: 1.42″ from center of aperture to top of rail
• Adjustment: Tool-less windage adjustment
• Origin: Made in the USA

For buyers looking for a proven polymer folding rear sight, the Magpul MBUS Rear Sight offers a clean balance of low weight, simple adjustment, compact stowage, and AR-platform compatibility. Its combination of spring-loaded deployment, protected dual apertures, and Picatinny mounting makes MAG248-BLK a practical rear back-up sight for rifle builds where weight, simplicity, and dependable sight access matter.