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AR-15 A2 Rear Apertures

3 reviews Write a Review
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Master Sgt. Paul Howe's (USA - Ret.) CSAT aperture provides the shooter with both a traditional notch and post for a 7 yard zero, plus a small aperture for a 100 yard zero, allowing the shooter to account for the 2.5" offset between those distances. Rear sight also includes a same plane large battle sight aperture, allowing the user to flip the sight for a wider field of view while maintaining zero.
Fits in Gen 2-3 TROY bases (Gen 1 bases need screw kit from XS®). Does not fit Ozark Armament Micro Flip Up BUIS.
Made in the USA.

View Written Installation Instructions


WARNING-Cancer and Reproductive Harm –

All XS Sights products are protected by our No Questions Asked Warranty. We will replace the product if it becomes damaged in any way or if the tritium stops glowing prior to 10 years. 30-Day Satisfaction Guarantee: Try a new set of night sights risk free for 30 days. If you are dissatisfied with your purchase you can 1. Exchange the sights for a different available option 2. Return the product to the point of purchase for a refund. Sights that have been installed and test fired qualify for this program. Products must be purchased through XSSIGHTS.COM or a participating dealer partner. All dissatisfied products must be returned. Sight installation fees incurred are not subject for refund. Return shipping is payed by the customer. For assistance email or call (888) 744-4880.

3 Reviews

  • 5
    Traditional cant-go-wrong option

    Posted by J on Feb 23rd 2022

    A well machined dual aperture, same plane so your zero is unaffected. No burrs or defects. Note that it has a large peep sized at .230, small peep at .100, so it's slightly oversized from the milspec of .200/.070, but I happen to like the XS size because you do get increased visibility and lighting at the theoretical cost of slight accuracy, so the tradeoff is worth it. Screws into mil-spec rear sight hardware without issue. Great to have this option.

  • 5
    AR-15 A2 Rear Apertures

    Posted by Frederick Duncan on Feb 19th 2022

    One of the best things I've added to my S&W M&P-15! Now I can switch between apertures, and the POA and POI doesn't change all over the place.

  • 5
    Does its job!!

    Posted by Max on Nov 23rd 2021

    Looks great, zeroed well, the larger aperture works great with a red dot co-witnessed.