The LG-404G green laser sight for 1911 pistols combines Crimson Trace's celebrated Lasergrips platform with the visible advantages of green laser technology. Using the smallest green laser diode available, the LG-404G emits a powerful green beam while still providing over two hours of run time on (4) #2016 batteries. 1911 Compact: Fits Colt (Officer's and Defender), Kimber (compact, ultra-carry and ultra-elite), Para-Ordnance (compact, single-stack), Springfield Armory (compact and ultra-compact) Wilson Combat and most other 1911's with grip screws measuring 2-11/16" apart. This product is not compatible with ambidextrous safety levers. Gunsmith installation is required.