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Magpul MBUS Rear Back-Up Sight Gen 2 - MAG248


You will receive fast, free shipping for all orders over $35

Shipping cost is $5.50 for orders under $35. We ship with UPS and USPS. 

Most orders ship out within 24 hours

You will receive tracking information immediately at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses.  

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you're dissatisfied with your purchase, in any way, please contact us at - we will do our best to make it right.

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The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding back-up sight.

The dual aperture MBUS Rear Sight is adjustable for windage and fits most 1913 Picatinny rail equipped weapons, but is specifically tailored to the AR15/M16 platform.

Made in U.S.A.


Impact resistant polymer construction provides light weight and resists operational abuse

Spring-loaded flip up sight easily activated from either side or by pressing the top

Detent and spring pressure keeps sight erect but allows for unobstructed folding under impact, etc.

Clamps to MIL-STD-1913 Picatinny/STANAG 4694 receiver rail and provides the same height-over-bore as standard A2 irons

Protective wings shield the dual, same plane flip apertures

Sight can still be folded with either large or small aperture in position

Detent knob easily and positively adjusts windage


MBUS – Rear Gen 2

Weight, w/ hardware: 1.3 oz.

Height above rail, stowed: ~0.51 in.

Center of aperture to top of rail: 1.42 in.

Length, stowed: 2.6 in.

Length, deployed: 1.5 in.

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