Save a ton of ammo with laser training bullets. Rated for use over 3000 times. Uses 3 377/376 batteries, not included. Remove from the barrel with a pencil or anything that can pop the cartridge out. These rounds may not be perfectly zeroed to your barrel. They should be close but may be slightly off. In this case, either use holdovers or a temporary adjustment of you optic/sights. NOT A REAL BULLET. Just shoots lasers.