Boresighters; Adjusting knobs for gun sights; Bipods for firearms; Firearm attachments, namely, mounts for attaching gun sights to a firearm; Firearm attachments, namely, mounts for attaching telescopic sights to a firearm; Foresights for firearms; Muzzle brakes that screw onto a rifle barrel; Non-telescopic gun sights for firearms; Protective lens covers for non-telescopic gun sights; Rifle scope rings; Sighting mirrors for guns; Sighting mirrors for guns and rifles; Sighting mirrors for rifles; Sights, namely, open sights for use on firearms; Sights, other than telescopic sights, for artillery; Sights, other than telescopic sights, for firearms