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AT3™ Flip Up Backup Iron Sights (BUIS) - Front & Rear Set - Same Plane or Gas Block Height

AT3™ Flip Up Backup Iron Sights (BUIS) – Front & Rear Set – Same Plane or Gas Block Height


MSRP: $45.99


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Lifetime WarrantyOn All AT3 Brand Products

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot Sights, Handguards, Iron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

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.

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 136 reviews

fastharry in Louisville here.....just bought and received (in 3 days..excellent shipping from AT3 btw) this low profile gas block sight set for my DPMS Oracle. Let me get to the bottom line....they fit great, they ARE the right height for the Oracle lower gas block in front and to be honest, i am not sure how Zak and crew are making these and selling them for 40 bucks. Even though they are not spring loaded (and they are not 200 either), they pop up and down with a satisfying "click".

I see NO reason to spend more and intend to use these as my primary sights...though now that I know what great quality AT3 is selling, their Red Dot sight might be on the way to Louisville soon, lol..

I also ordered a Magpul mag (the 3rd gen one) and it came perfect in Magpul package....so no worries if you are ordering other stuff as well.

VERY SATISFIED with AT3 and their customer service...great job Zak!

Looking good! Thanks for sharing your experience, Harry. We work hard to meet expectatins like yours, we're so glad we hit the mark for you. Cheers!
Gas block height front and rear flip up sights.

Front and rear sight arrived with chipped finish. Front sight seems to be ok. Rear sight leaves a lot to be desired. When flipping from small to large "hole" the movement moves the windage screw, either left or right making your zero off, rendering it useless in my opinion. Maybe they will make it right.

Sorry to hear about the issue, Matthew. Sounds like you received a defective product. Please reach out to us so we can further assist. UPDATE (2/15): Customer called in requested to change review to a 5-star, but we expect to get it right the first time We appreciate his follow-up and his nice comments however. Per Matthew: 'AT3 made good on the mistake. Good backup iron sight for the price.' Thanks Matthew! -Luke
Perfect !

Great product at a great price. Super easy to mount and well made. Highly recommend.

Thanks for sharing your feedback, John. We're glad you're satisfied with your purchase. - AB
Installed on DPMS Oracle 5.56

Purchased for new gun. Appear to be well made. Due to poor weather haven't tried them out yet but should work well.

Thanks for sharing your feedback, John. We're glad you're satisfied with your purchase - AB
Well made

Well made sights. mice finish.

This sight will not fit under the AT3 Magnifier.

Amazing customer service!


Thanks for sharing your experience, Mitch. We're glad you liked it. - AB