9mm laser bore sight module with external battery box. Designed to make it quick and easy to bore sight your 9mm. Will not work on most semi-automatic pistols if you have to close the action to lock the barrel. Must have fixed barrel to function (i.e. Uzi, AR-15 in 9mm, etc). If in doubt about function, check with your local gun smith or manufacturer or see our FAQ. Ideal for use with Pistol Caliber Carbines (PCC) or 9mm AR platform with fixed barrels. The external battery pack gives you 20+ hours of laser output utilizing 2 AAA batteries. 
 
<5mW FDA Class IIIa laser