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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!
    • Backed by the AT3 Lifetime Warranty
    • 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 121 reviews
    Great BUIS

    These are great budget back up sights. The rear sight would not handle the recoil on my AR and would flip half way down after every shot. I contacted AT3 to see if there was some kind of adjustment that could be made to tighten it up and they sent a replacement out immediately that day. The only reason for 4 instead of 5 stars is that the first one had an issue. They hold zero fine and they are out of the way when flipped down. I would recommend these and buy them again. They arrived quickly too.

    We are glad to hear these sights still worked out for you after the first were replaced.
    AT3 buis

    Shipped promptly, appear well made. Installed quickly. Font sight had what appeared to be dried grease which made hard to turn. A little ballistol and cleaned right. Cowitnessed with my read dot. Would buy again.

    Martin, Glad to hear your order installed well and paired with your red dot. We look forward to your future orders with us.
    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.

    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!

    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.