Pristine 1955 USGI .45 Auto produced by the now defunct Twin Cities Arsenal! Own a very cool piece of American military history! Will make an excellent addition to your collection. These cartridges are steel cased, boxer primed, and thought to be non corrosive, although if you plan on shooting these, it's best to clean your gun after firing just to be on the safe side. Ammunition is steel cased, boxer primed, and features a 230 grain full metal jacket projectile.