Patent ID: 9551557
Date: 2017-01-24
CPC Classifications: F42B,F42C

Claim:
1. An ammunition having a two piece primer insert comprising: the two piece primer insert comprising: an upper primer insert portion comprising an upper primer bottom surface, an upper primer aperture through the upper primer bottom surface; a substantially cylindrical coupling element extending away from the upper primer bottom surface, and an interior surface inside the substantially cylindrical coupling element; a lower primer insert portion comprising a lower primer bottom surface opposite a lower primer top surface, a primer recess in the lower primer top surface that extends toward the lower primer bottom surface and the primer recess adapted to fit a primer, a lower primer aperture through the lower primer bottom surface, and a flange that extends circumferentially about an outer edge of the lower primer bottom surface, wherein the flange is adapted to receive a polymer overmolding; and an insert joint that links the upper primer bottom surface and the lower primer bottom surface to align the lower primer aperture with the upper primer aperture and form the two piece primer insert; a primer flash aperture extending through the lower primer aperture and the upper primer aperture; a substantially cylindrical polymeric middle body extending from the substantially cylindrical primer insert to a cylindrical middle body coupling region molded from a first polymer composition, wherein the first polymer composition is molded over the flange, the interior surface of the substantially cylindrical coupling element and an outer surface of the upper primer insert and extends to the cylindrical middle body coupling region; a primer inserted into the primer recess; a substantially cylindrical polymeric projectile end mated to the substantially cylindrical polymeric middle body, wherein the substantially cylindrical polymeric projectile end comprises a projectile end coupling region that extends to a shoulder region that reduces to a neck region having a projectile aperture wherein the projectile end coupling region couples to the middle body coupling region; a propellant chamber defined between the primer flash aperture and the projectile aperture; a propellant at least partially filling the propellant chamber; a projectile frictionally fitted in the projectile aperture; and a primer flash aperture groove positioned in the primer recess around the primer aperture flash aperture and the first polymer composition extends into the primer flash aperture to form a flash hole.