Out of stock
SKU: MPIMAG248BLK
UPC: 873750004358
The Magpul MBUS Flip-Up Backup Sight in Black (MPIMAG248BLK) is a proven backup iron sight designed for AR-15 and M16 platform rifles equipped with Picatinny rails. Built from injection-molded polymer, the MBUS rear sight combines lightweight construction with the durability operators have relied on in the field for over a decade. This spring-loaded flip-up sight serves as an essential redundancy layer when primary optics fail or require battery replacement during extended operations.
The dual-aperture design allows shooters to select between two same-plane sight pictures without rotating the unit, accommodating both close-quarters engagements and extended-range precision work. Windage adjustment is provided for zeroing, while protective wings shield the apertures from debris and incidental contact during vehicle or building operations. The sight activates from either side with a light thumb press or by tapping the top, enabling rapid deployment when needed. At 0.13 lbs, the MBUS adds negligible weight penalty compared to the reliability benefit it provides. The compact 4.05 x 1.25 x 6.6-inch footprint doesn't interfere with upper receiver mounting or standard charging handles.
Law enforcement patrol rifles, military trainers, civilian defensive shooters, and range competitors regularly employ backup sights as part of a layered optics strategy. The MBUS rear sight pairs with any compatible front sight—Magpul MBUS front or aftermarket alternatives—to establish a complete iron sight system. This configuration is particularly valuable on patrol-ready carbines where optic malfunction must not compromise mission capability.
Magpul backup sights occupy a cost-conscious middle ground between commercial polymer sights and precision-machined steel units. The MBUS has become the category reference standard, adopted across military training pipelines and issued to reserve components. Owning redundant aiming systems reflects professional-grade rifle setup philosophy: every critical system requires a backup.
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