Firearm capable of firing different-sized cartridges

Firearm cartridge and case-less chamber

Firearm for firing ammunition of different caliber

Firearm with interchangeable barrels

Firearm with reversible barrel

Firearms intended to fire a caseless projectile, and ammunition

Fired bullet identification system

Flash suppressor apparatus and methods

Flashless electric firearm and ammunition therefor

Fluted gun barrel

Full gain twist ratchet rifling

Graphite/metal matrix gun barrel

Gun

Gun barrel

Gun barrel choke

Gun barrel construction

Gun barrel equipped with optimized rifling

Gun barrel for use at high temperature

Gun barrel having an erosion-reducing lining

Gun barrel insert