Machined to fit seamlessly while bringing both artistry and rugged engineering to John Browning's classic 1911 design, Green Master Series Lasergrips are sure to impress. Featuring ergonomic and aggressively durable G10 side panels with a rubber overmolded activation button. these are the ultimate laser sights. Standard to Crimson Trace Lasergrips, the LG-904G features Instinctive Activation. This means that the laser sight automatically springs to life when the weapon is held in a natural firing grip. Fits 1911 and 1991A1 full-size frames, including: Auto-Ordnance, Les Baer, Colt, Kimber, Nighthawk Custom, Olympic Arms, Para-Ordnance (full-size, single-stack), Safari Arms, Sig Sauer, Smith & Wesson, Springfield Armory, Taurus, Dan Wesson, Wilson and most other 1911's with grip screws measuring 3-1/16" apart..