Home » Gun Information » Gun Glossary | Gun Terminology » Fully Automatic (Full-Auto) Fully Automatic (Full-Auto):A fully automatic (full-auto) firearm is a design that continuously feeds cartridges, fires, and ejects cartridge cases as long as the trigger is fully depressed and there are cartridges available in the feed system. Share this gun news:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)