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AR-15 Tritium Flip-up Backup Iron Sights (BUIS)

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Samson manual flip up sight bases are constructed from aluminum, have stainless steel clamps, and are hard coat anodized. With milspec dimensions, the sights lock into position and attach to any 1913 Picatinny rail.

Functional Lightweight Design - At 3.05oz, the set adds minimal weight to your setup while maximizing utility

Front sight features XS Tritium Stripe front: 0.105” wide front post with vertical tritium stripe and white painted outline for visibility in any light.

Rear sight features XS CSAT same plane aperture: CQB situations made easy with notch providing a 7 yard zero, aperture a 100 yard zero, or flip to the large battle aperture, all while maintaining zero.


Prop 65 warning WARNING: This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or reproductive harm. (For more information go to

Tritium Products — XS Sights warrants all handgun sights containing tritium to be free from defects in material and workmanship. Tritium illumination is warranted to glow for twelve (12) years. This warranty applies only to the original purchaser. Proof of purchase is required for an RMA. If this product is found to be defective, the manufacturer's only obligation is to replace the product at the manufacturer's discretion, provided that the product has not been damaged through misuse, modifications, neglect, or mishandling. XS Sights will not be responsible for product removal or installation labor costs. — Tritium illumination will dim throughout the product's life and is not subject to warranty claims. This warranty shall not apply to the finish on any portion of the product or weathering, as this is considered normal wear and tear. Sights improperly installed are not subject to warranty. — XS Sights only warrants products sold through authorized resellers. — All international sales are final and do not qualify for this warranty policy. Some authorized international resellers carry common warranty items to provide for their customers. For more information, please see our International Shipping Policy.

2 Reviews

  • 5
    CSAT AR15 F/R Backup Sights

    Posted by TC Link on May 26th 2022

    Quickly able to P/U the rear sight for quick 7 yard shots without having to account for the offset of my red dot.

  • 5
    Innovative CSAT aperture for your zeroing/holdover needs

    Posted by J on Feb 23rd 2022

    Nice packaging from XS as always. This is an excellent backup sight that flexes very well into being a full-time iron sight, or folds away in a low profile until you need it. The CSAT aperture designed has notches for a 7 yard point of aim/point of impact, with a corresponding 100 yard zero for the small peep sight. And has a 0.2” large peep for normal low light or close range use. So you get a one-size-fits all in 1 package. Aperture clicks into position well with no looseness or wobble. The only design issue is that to fold the rear sight, the CSAT needs to be flipped down as well, so it is an additional step to get access to the aperture once folded up. It will also take training to distinguish between the 7 yards and the 100 yards as there is a small notch separating the two which depending on your distance from the sight, may appear blurry. I found that with putting in the reps in both dry and live practice, it was very doable. The CSAT Aperture is protected by ears, has a very definitive tactile and audible windage clicks. The sight base is made by Samson Manufacturing (Made in the USA), a well known aftermarket accessory maker. It feels plenty rugged, and has a very secure steel bar to prevent it from folding down until you decide to manually do so. The manual flip up operation is smooth with no burrs. Just note that if you are trying to get this to fit folded under an LPVO, you will need a 1.6” centerline height. Or you could go with the XS Offset sights to avoid this issue.