US Patent 10215530 Laser firearm sight apparatus

The present invention is a laser firearm sight apparatus that has a housing attachable onto the external threads of a firearm muzzle, a light source having at least two lasers emitting laser beams, and an activating mechanism for activating and powering the light source. The housing defines a longitudinal bore for universal attachment onto several different muzzles of different types of firearms of the same caliber barrel while keeping the laser sight accurate within an acceptable range without further adjustment. The lasers emit a beam that is concentric and parallel with the muzzle and bore of the firearm.