The LaserLyte part number 1226991 is a versatile .45 ACP laser trainer and bore sight cartridge. It allows you to practice dry-fire shooting or zero in your iron sights and optics without spending live ammunition or leaving the comfort of your home. Key features and functionalities of this specific model include: Dual Functionality: Features two swappable end caps. The "Bore Sight" cap stays constantly ON so you can line up your sights, while the "Trainer" cap is firing pin-activated, emitting a momentary red laser to show bullet impact. Electronics Training Compatibility: The trainer cap works flawlessly with LaserLyte interactive electronic targets. Power Source: It drops safely into the chamber and operates on included batteries.