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XTI2 45 Degree Offset BUIS Gen 1 Upgrade Kit

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Already own an XTI angle offset sight set and want to upgrade to the XTI2? This kit includes the improved base design that raises the sight picture up, allowing visibility around wider lens optics, while maintaining a standard cheek weld. Uses existing cross screws, base clamps, rear sight blade, and front sight blade. A spare front sight detent plunger and spring are included in case they disappear upon disassembly of the original XTI front.
XS XTI2 sights are a close-quarters, secondary sighting solution for a fast sight transition from a magnified primary optic. XTI2 sights reduce target engagement time and eliminate magnification adjustment. Our second generation XTI’s feature taller bases for easy sight alignment, without having to break a standard cheek weld. Additionally, the base angle has been increased to accommodate wider lens optics.


  • Rear Sight Windage Adjustment - Rear sight is driftable allowing easy windage adjustability
  • 6061 T6 Aluminum Bases - Keeps rifle weight as light as possible
  • Fully Ambidextrous - Front and rear sight can be rotated for left handed shooting
  • Easy Bolt on Installation - Top rail installation allows for fitment on all optic ready AR-15 rifles
  • Item Number: AR-9901-1

Kit does not include XS Block


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

Non-Tritium Products — XS Sights warrants all non-tritium products to be free from defects in material and workmanship. 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. 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.