Adjusting knobs for gun sights; Bipods for firearms; Firearm attachments, namely, modular external rail systems for attaching accessories to firearms; Firearm attachments, namely, modular external rail systems for firearms; Firearm attachments, namely, mounts for attaching ancillary equipment to a firearm; Firearm attachments, namely, mounts for attaching gun sights to a firearm; Firearm attachments, namely, mounts for attaching laser pointing devices to a firearm; Firearm attachments, namely, mounts for attaching lights to a firearm; Firearm attachments, namely, mounts for attaching night vision devices to a firearm; Firearm attachments, namely, mounts for attaching telescopic sights to a firearm; Non-telescopic gun sights for firearms; Protective lens covers for non-telescopic gun sights; Rifle scope rings; Sighting mirrors for guns and rifles; Sights, namely, open sights for use on firearms