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Magpul MBUS 3 Sight – Rear


Video | What’s Included | Specs | Pictures | Restrictions | Related Info

These Magpul BackUp Sights (MBUS 3) take the affordability of the original MBUS sights and the low profile of the MBUS Pros and combine them to create the optimal balance between cost, weight, and profile. Their impact-resistant polymer construction keeps weight to a minimum while being durable enough to withstand abuse, and the toolless adjustments make zeroing quick and easy. If you want a folding front sight to match, we carry the MBUS 3 folding front sight as well. Or, if you want to run a fixed front sight, this rear sight will pair perfectly with the PRI or Scalarworks fixed front sights we offer.


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One Magpul MBUS 3 rear iron sight

We include an 8.5″ x 11″ rifle target with every iron sight. We recommend a 50/200 meter zero for most 5.56 rifles. (Click on the thumbnail for a printable version.)
How to Zero in 2 Minutes – Video – T.REX ARMS

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  • Impact-resistant polymer construction provides a lightweight yet robust system
  • Toolless adjustment
  • Clamps to most MIL-STD-1913 Picatinny rails
  • 0.55” high when folded and 1.38” wide at widest point
  • Standard AR height when deployed

Made in the USA.

View the User Manual HERE.


Weight1.0 ounce (rear only) 1.9 ounces (front and rear)
Length2.43 inches
Width1.38 inches
Height0.63 inches (total) 0.55 inches (above rail)
Centerline Height1.41 inches
Aperture Size0.063 inches (small aperture) 0.19 inches (large aperture)
Windage Adjustment ~0.5 MOA (0.606”/100m) per click with a 14.5″ sight radius
~0.4 MOA (0.439”/100 m) per click with a 20″ sight radius

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Magpul products cannot be shipped outside of the US.

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Consistency, Recoil, Trigger Management With a Stock M4 – Video – T.REX ARMS

Training with Rifle Irons – Scalarworks PEAK – Video – T.REX ARMS

50 Round Carbine Course of Fire – Drills – T.REX ARMS

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