Finallya |realistic dry-fire practice, at home, with YOUR gun. The caliber-specific LaserLyteA(R) .223 Rem. Laser Trainer Cartridge fits inside your firearm's chamber-pull the trigger, and a firing pin-activated switch powers a laser that indicates bullet "impact" with a bright red laser dot visible from over 100 yards away at night. Allows easy dry-fire practice anywhere Fits .223 Remington or 5.56 x 45mm NATO firearms Fits inside the chamber Automatically activates when chamber is closed Firing pin-activated switch that indicates bullet impact with bright red laser dot Rubber centering ring keeps the laser accurate Built-in snap cap protects your firing pin when dry firing Works with all LaserLyte targets Laser can be seen from over 100 yds. away at night Power output: 650nm No tools required Runs on (3) 377 batteries Order today!