Patent ID: 8938903
Filing Date: 2015-01-27
Classification: F41A

Abstract:
1. A firearm, comprising: a receiver mechanism having trigger and firing mechanism; a one piece barrel being mounted to said receiver mechanism and defining a barrel bore and having a breech end; a cartridge chamber being defined formed within said breech end of said one piece barrel according to the geometry and dimension of a selected ammunition cartridge and having communication with said barrel bore, said cartridge chamber having a tapered internal body wall surface and having an internal conical cartridge case shoulder support and sealing surface and a cylindrical internal cartridge case neck support and sealing surface having circular intersection with said internal conical cartridge case shoulder support and sealing surface; and said tapered internal body wall surface being defined by a plurality of elongate circumferentially spaced internal elongate land surface segments having a predetermined diameter and a plurality of elongate circumferentially spaced elongate relief surface segments each being disposed between adjacent elongate circumferentially spaced internal elongate tapered land surface segments and having an internal diameter greater than said predetermined diameter and being smoothly merged longitudinally with adjacent ones of said elongate circumferentially spaced internal land surface segments.