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    AT3 Tactical Flip Up Backup Iron Sights (BUIS) provide dead-on accuracy, superior durability, and the best value for AR-15 iron sights!
    Available in 2 types:

    Gas Block Sights - for mounting on gas blocks that are lower than the upper receiver (usually about 1/4" lower than the upper receiver rail)

    Same Plane Sights Made for mounting on quad rails or other rails at the same height as the upper receiver

    • A2 style sights - adjustable front sight post height, and dual aperture rear sight with windage adjustment
    • Easy to install and sight in. Reliable and accurate.
    • Optional - Save $3.95 when you add a Front Sight Adjustment Tool for only $8. This tool makes it a breeze to zero your sights!
    • Also check out our 45 Degree Offset Iron Sights - great for rapid transition between short and long range targets!
    • Material: 6061 aircraft aluminum
    • Finish: Hardcoat Anodized (black)
    • Weight:
      • Gas Block Sights: 3.3oz (Rear) & 3.0oz (Front)
      • Same Plane Sights: 3.3oz (Rear) & 2.6oz (Front)
    • Packaging: PE Bag
    • Mounts to: Picatinny rail
    • Height when flipped down: .75" (front), 1" (rear)

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    Customer Reviews

    Based on 119 reviews
    Jason G. J.G. Jason G.
    Good sites - Great service

    Received one sight that was not working correctly. Contacted them and they immediately sent out a replacement. I gave 5 stars for the much appreciated service, as for the sights they feel solid and the one that works is nice. Will have to update once I receive the replacement and get them shooting.

    Garry R. G.R. Garry R.
    AT3 Tactical BIUS

    I ordered these sights for my new AR to give it a finished look because it didn't come with any sights at all. They fit perfectly and work great! Here's a pic of my DPMS Sportical!

    John M. J.M. John M.
    A great priced mid level +, front & rear sight of solid quality.

    Easy to place on rales. This is the second purchase. One on a AR 15, and one on a AR style .308. Has two peep sights of different sizes that flip up & down within the sight frame.. Sights fold down so your able to use a red dot or scope. Unless you shoot every day & go thru thousands of rounds regularly. These will work for a long time.


    AAA+++ Great.

    Jeff Hickok J.H. Jeff H.
    Homemade AR-15

    Needed a front sight to fit a lower gas block. Both of these sights work just perfect together. Easy install, easy adjust. Tough.