Designed and manufactured for Picatinny or Weaver-style pistols and rifles the Crimson Trace Rail Master Universal Laser Sight is built with quality materials and is ergonomically correct for the maximum in comfort and effectiveness. It fits seamlessly onto any rifle or pistil with the correct rail and it is made to be lightweight and durable. The laser is bright in any light condition and has a life of up to 4 hours. It features Instant Activation as the laser will come to life the moment the firearm is raised to a normal firing position.