XS Sight Systems CSAT Rear and Tritium Stripe Front Rifle Sight AR Mil-Spec Matte Black Standard. 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. XS Tritium stripe front sight for the AR features precision machined stress proof steel a vertical tritium vial and white outline to provide front sight visibility in any lighting condition. Square top post is 0.105" wide. Each full rotation of front sight gives a 5" shift at 100 yards. Fits AR front sight housing with front sight detent at 3 6 or 9 o'clock. Does not fit ARMS back up sight; the blade front to back is too long to allow the tower to fold into the down position. Rear aperture fits in Gen 2-3 TROY bases (Gen 1 bases need screw kit from XS). Does not fit Ozark Armament Micro Flip Up BUIS. Specifications for XS Sight Systems CSAT Rear & Tritium Stripe Front - AR Mil-Spec: Manufacturer: XS Sight Systems Color: Matte Black Additional Features: CSAT Rear Tritium Stripe Front Condition: New Sight Position: Front and Rear Gun Model: AR-15 Gun Make: AR Platform Front Sight Color: Green Rear Sight Color: Front Sight Only Fabric/Material: Precision Machined Stress Proof Steel Size: One Size Illumination Type: Tritium Gun Type: Rifle Included Accessories: Standard Mount Type: Dovetail Finish: Mil-Spec Attachment Type: Screw Offset: 2.5 in Package Contents: XS Sight Systems CSAT Rear & Tritium Stripe Front - AR Mil-Spec What firearm models does the manufacturer say XS Sight Systems CSAT Rear & Tritium Stripe Front - AR Mil-Spec is compatible with? The manufacturer suggests that XS Sight Systems CSAT Rear & Tritium Stripe Front - AR Mil-Spec is compatible with AR-15XS Sight Systems AR-0005-7: CSAT Rear and Tritium Stripe Front Rifle Sight AR Mil-Spec Matte Black Standard