The Crimson Trace LG-525 improves the AR-15/M-16 shooter's vision, awareness and safety. The shooter can keep critical visual contact with the target, as opposed to getting behind the rifle. And still, the shooter maintains a high level of precision aiming capability. The LG-525 is engineered to integrate cleanly into any A1 or A2 upper, following the same visual design lines as the factory grip. It adds no weight to the front of the rifle, because the entire unit is on the receiver, and adds only 3 ounces to the rifle. The LG-525 is compatible with most weapon mounted lights and will not interfere with carry-handle scope mounts. The laser is powered by one standard 123A - 3-volt lithium battery and is good for more than 20 hours constant-on time.