Patent ID: 8713839
Filing Date: 2014-05-06
Classification: F41A

Abstract:
1. A firearm throat coaxially aligned and disposed between the free bore and rifle bore for reducing chamber pressure and improving bullet accuracy, comprising; a. a short first step located adjacent to the free bore of a rifle, said first tapered step being beveled inward from said free bore and includes an inside surface; b. a cylindrical elongated body extending forward from said first step, said elongated body includes straight side walls with an inside surface; c. a short second step attached to or integrally formed on an end of said elongated body opposite said first step, said second step being beveled inward and coaxially aligned at one end with said elongated body to match the smaller diameter rifle bore adjacent to said elongated body, said second step includes an inside surface; and, d. at least one continuous spiral groove formed on said inside surfaces of said first step, said elongated body, and said second step, said spiral groove configured to engrave rifling on said bullet as it travels from said free bore and into said rifle bore.