Patent ID: 7610858
Filing Date: 2009-11-03
Classification: F42B

Abstract:
1. An ammunition cartridge comprising: (1) a substantially cylindrical polymeric cartridge casing body defining a casing headspace, with an open projectile-end for receiving a projectile and an end opposing the projectile-end, said casing body comprising: (2) a cylindrical cartridge casing head-end component comprising an essentially closed base end with a primer hole opposite an open end comprising a coupling element that is a mate for said coupling element on said second end of said middle body component joining said open end of said head-end component to said second end of said middle body component; wherein said projectile-end of said bullet-end component comprises an opening having an inner diameter in which any one point has a smaller diameter than the diameter of said projectile; wherein said middle body component is formed from a material that is more ductile than the material from which said head-end component is formed but equal to or less than the ductility of the material from which said bullet-end component is formed; and wherein said polymeric bullet-end component is formed from a polymer having all of the following properties: wherein said polymeric middle body component is formed from a polymer having all of the following properties: