Designed to be used with an external battery pack the battery bore sight systems provide the extended run time that the traditional bore sight cannot. Allowing the operator 20+ hours of run time off 2 AAA batteries this system offers the most economical solution for all bore sighting needs. AimShot 223 green laser bore sight. The only green laser chamber bore sight on the market. AimShot has taken the traditional external battery pack 223/5.56 laser bore sight and converted it into a high performance green laser bore sight with the addition of a green laser diode. With the external battery pack (2AAA batteries included) and high output green laser it’s no problem to get optics mounted even in full sunlight. This laser is also the basis for the AimShot rifle caliber laser bore sight system and is used in conjunction with the AimShot Rifle Arbors to bore sight most major rifle calibers. Insert 223 brass laser module into chamber and align scope reticle to match laser beam at 20 yards. Remove laser and proceed to the range for final adjustments at whatever range you want your zero.