LaserMax has created one of the best internal laser sighting systems available. The unit easily replaces the original recoil spring guide to allow the laser to actually become part of the weapon which in turn become more accurate without the bulky add-ons. FEATURES: - Totally internal-cannot be knocked out of alignment - No permanent modification to gun-remove it anytime - No need to change holster or give up your rail flashlight - Compatible with your favorite grips and aftermarket accessories - Drops into place, replaces original recoil spring guide - Ambidextrous switch in custom take-down lever - Deliberate on/off activation-no squeezing the grip, no shaking - Pulsating beam for increased visibility - Factory aligned (1911 models are also user adjustable for fine tuning) - Quality assurance includes live test firing - *Pistol Not Included. Manufactures Website Address www.lasermax.com Warranty Information Three-year warranty (excluding expendable parts).