Dual purpose laser trainer cartridges offer unmatched versatility. with the Laserlyte Bore Sighter and Trainer Cartridge, quickly and easilt sight in your iron sights, laser sights, or optics without going to the range using the bore sight end cap. Swap out and use the laser trainer cap to train with Laserlyte trainer targets. FeaturesEach cartridge includes two swappable end caps to allow for use as a bore sight cartridge or laser trainer.Easily drops into the chamber without damage and aligns to the bore. Batteries includedLaser trainer cap is firing pin activated and emits a red laser for a split second to show bullet impact every time your hammer or striker fires.Laser bore sight cap is constant ON for accurate sight-in of scopes, red dots, iron sights or laser sights.Firing pin activated laser trainer cap works with all LaserLyte targets for dry fire practice.