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Magpul MBUS Rear AR 15 Back-Up Sight Gen 2 - MAG248

Magpul MBUS Rear AR 15 Back-Up Sight Gen 2 – MAG248


Out Of Stock

90 Day No-Hassle Returns We Pay Return Shipping

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

If you need to request a return, contact us at support@at3tactical.com 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 support@at3tactical.com. 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 support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

The MBUS (Magpul Back-Up Sight) is a low-cost, color injection molded, folding AR 15 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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Customer Reviews

Based on 5 reviews
Piece doesn’t fit tight

Hi I am very happy with the look however the rear sight is shaky/loose on the rail. Is there any way you could send me another and i’ll send this one back.

Thanks in advance, Rob.

Sorry to hear about the issue, Rob. We sent you an email and hoping to hear back from you. We'd like to get this issue resolved the soonest.
Works and looks great

I ordered my lower receiver three weeks ago, my upper 2 weeks ago and this product with a Handguard 1 week ago. I got these before either of my other purchases (which were not from this site) even came in. They look and feel just as they should. Great shipping and great products. My first time buying from at3 but will not be my last. My new go to store.

Thanks for sharing your feedback, Cole. We're glad you're satisfied with your purchase. Cheers!
Real review

This company is elite. My order came in faster than I thought. Mbus sights were snug but will fit with the tap of a hammer.

Thanks for sharing your experience, Cory. We work hard to meet expectations like yours, we're glad we hit the mark for you. Cheers!

Excellent shipping

Thanks for the feedback, Cory! -- LM


Thank you for the feedback, Randy! We're glad you're liking it