AAOK

6V LED Tactical Weapon Light.  Made in Isreal by FAB Defense.

It is possible to upgrade your Mossberg 500 with a flat butt shape & upper Picatinny rail.

Just install the provided batteries and twist the cap on. Drop the laser into the chamber of your rifle and you have a laser that is projecting the exact alignment of the bore. This tool is extremely useful for initial scope sight in, or to confirm zero before the big hunt. Made of durable aluminum, the Cartridge Laser Bore Sighter is light weight yet tough as nails. Use it for your scopes, red dot sights, or even your iron sights!