XS Tactical Sights improve your sight picture in all light conditions and increase your sight acquisition speed. The Ghost Ring Rear Sight allows the shooter to change the apertures without changing the rifle's zero. Features a large .230" tritium aperture for close range shooting and a precision .100" aperture for accuracy at long range. Front Tritium stripe provides quick acquisition with it's easy to see .105" diameter. Sights fit A2 housing.