The LG-401G green laser sight for 1911 pistols combines Crimson Trace's celebrated Lasergrips platform with the visible advantages of green laser technology. Using the smallest laser green laser diode available, the LG-401G emits a powerful green beam yet still provides over two hours of run time on (4) 2016 batteries. The LG-401G utilizes Crimson Trace's famed Instinctive Activation technology - meaning that when the pistol is held in a normal firing grip, the laser sight is activated. A Master On/Off switch allows the shooter to completely power down the unit for range training without the laser. Green Lasergrips set a new standard in 1911 green laser technology. This product is not compatible with ambidextrous safety levers. We stock shortened ambi-safeties from Wilson Combat in Black and Stainless. Gunsmith installation is required. Fits 1911 Full Size frames: Auto-Ordnance, Les Baer, Colt, Kimber, Nighthawk Custom, Olympic Arms, Para-Ordnance Full-Size/Single Stack, Safari Arms, Smith & Wesson, Springfield Armory, Taurus, Dan Wesson Wilson Combat and most other 1911's with grip screws measuring 3-1/16" apart.