Great item - G-Sight Training Laser Cartridge - Gen2 w/Laser Training Pro App

This is a great item, a must have, can not put it down. Endless hours of shooting. Only thing I could see needs to be added is replacement o ring in package. You can use it with the app or with out. Watch your groups get tighter and tighter every week. I Placed a target at 50 feet and shoot a few times a week now with no ammo cost.