Finely tune your sharpshooting skills without wasting ammo with the G-Sight Training Laser Cartridge - Gen2 w/Laser Training Pro App. Just load these caliber specific Laser Trainers by G-Sight into your firearm and receive instant visual feedback of your shots thanks to the firing pin activated laser. The G-Sight Gen 2 Target Training Cartridge is completely safe and will not damage your gun. In fact, these practice cartridges contain a harderened rubber primer that functions like a snap cap and ensures the safety of you firing pin. The cartridges record where your shots are landing, and you can use the app to view where your shots on target were. Plus, these cartridges are equipped with two O-rings that establish a stable and accurate fire down the barrel of your firearm. If there is a sizing issue, these O-rings can be easily removed. Master the dynamics of your firearm with the G-Sight Tactical Training Laser Cartridge w/ App and become a professional sharpshooter without wasting countless bullets perfecting your shot.