There's a reason LaserMax Guide Rod lasers are as rugged as your gun: they sit inside it. Developed with close guidance from law enforcement officers, it's a smart design patented almost two decades ago and has worked perfectly ever since. Even today, these Guide Rods are still the most technically advanced, hardened laser systems on the market. User installed in minutes, the laser sits just under the bore giving you the closest point-of-aim and point-of-impact. Five story drops, 20-ton crushes, freezing in ice, roasting in flames, drowning in watery depths of 66 feet, 20,000 round firings. These Guide Rods lasers survive all of these tests and more. The convenient on/off Mfg: Lasermax SPECS: Stainless steel or aluminum housing, depending on model. Steel takedown lever/activation switch. Dot size: 5/16" at 7 yards (6.4m), A 3/4" at 25 yards (22.9m). Batteries and instructions included. Beretta not compatible with 92A1 or 96A1 models.