The XS CSAT Rear Sight for AR-15 rifles from XS Sights (XS Sights part no. AR20049) is built on Master Sgt. Paul Howe’s CSAT aperture design. It gives you a traditional notch and post for a 7-yard zero plus a small aperture for a 100-yard zero, which accounts for the 2.5-inch offset between those distances. A same-plane large battle sight aperture lets you flip the sight for a wider field of view while keeping your zero. It replaces mil-spec rear apertures, so it suits a carbine or rifle that runs both close-range and distance work.

Key Specifications

• The sight is a CSAT rear aperture for the AR-15, designed by Master Sgt. Paul Howe (USA, Ret.).
• A notch and post gives a 7-yard zero for close range.
• A small aperture gives a 100-yard zero for distance.
• The two zeros account for the 2.5-inch offset between 7 and 100 yards.
• A same-plane large battle sight aperture flips for a wider field of view while maintaining zero.
• It replaces mil-spec apertures that use the standard 10-36 windage screw.
• The finish is black oxide, and the sight is non-tritium.

Frequently Asked Questions

Will it replace my mil-spec rear aperture? XS says it replaces mil-spec apertures that use the standard 10-36 windage screw.

Does it need to be re-zeroed to switch between ranges? The notch and post gives a 7-yard zero and the small aperture a 100-yard zero. XS says the large battle sight aperture flips for a wider field of view while maintaining zero.

Is this a tritium sight? No. It is a non-tritium sight with a black oxide finish.

Buy the XS CSAT Rear Sight

Add a rear sight with both a 7-yard and a 100-yard zero to your AR-15. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse more gun sights from the rest of the lineup.