AimShot Modular Battery Pack External Battery pack upgrade for existing AimSHOT 223 laser bore sight owners convert your bore sight to run on 2 AAA batteries (not included) for 20+ hours of laser usage simply remove your original end cap and batteries, and thread in the new Compatible with all versions of the AimSHOT 223 laser bore sight (BS223, BS22320x, BS204, and the new SpeedAim SA223)