The LaserLyte 1226988 is a brass .223 Remington/5.56 NATO laser trainer cartridge and bore sighter. It allows shooters to practice dry-firing or sight-in their optics at home without using live ammunition. Dry-Fire Practice: When the trigger is pulled, the firing pin strikes the built-in rubber snap cap, activating a red laser that flashes for \(1/10\)th of a second on the target. Dual Purpose: Can be used as a laser trainer with LaserLyte targets or as a bore sighter to quickly align iron sights and optics. Specs: Features a visible, Class 3A red laser (650 nm). Battery Life: Runs on standard batteries good for up to 3,000 shots.