Crimson Trace LG-401G Front Activation Lasergrips 1911 Full-Size Laser Sight - Green - The LG-401G Lasergrips green laser sight for 1911 handguns 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 handgun 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. Please note, this product is not compatible with ambidextrous safety levers. Crimson Trace stocks shortened ambi-safeties from Wilson Combat in black and stainless (gunsmith installation required). Fits Most 1911 And 1991A1 Full-Size Frames With Grip Screws Measuring 3-1/16in Apart; Beam Intensity: 5mW Peak, 532nm, Class 3R Green Laser; Adjustable For Windage And Elevation; Dot Size: Approximately 0.5in At 50ft; Front Instinctive Activation Button; Black Grip Replacement;