Featuring a compact design to easily and securely fit full-size pistols, the Sightmark ReadyFire LW-R5 Red Laser Sight is ready for anything. The laser mounts between the trigger guard and muzzle of any railed, full size handgun and at only 2.3 ounces it doesn’t add unnecessary weight to the firearm. Visibility extends to 20 yards during the day and an impressive 300 yards at night. The ReadyFire LW-R5 is energized by two AG13 batteries that can last up to seven hours. With easy to use slide switch activation, the 5 mW laser is shockproof and extremely durable. Designed with a weaver/picatinny mount, the ReadyFire LW-R5 has an operating temperature range of 0°F to 120°F, making it the laser of your choice for almost every shooting scenario.