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One piece polymer ammunition cartridge having a primer insert and methods of making the same

  • US 10,704,877 B2
  • Filed: 08/23/2018
  • Issued: 07/07/2020
  • Est. Priority Date: 11/10/2010
  • Status: Active Grant
First Claim
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1. A single piece polymeric ammunition comprising:

  • a primer insert comprising a top surface opposite a bottom surface, a coupling element extending away from the bottom surface and a primer recess in the top surface that extends toward the bottom surface, a primer flash aperture positioned in the primer recess to extend through the bottom surface, and a groove that extends circumferentially about the primer flash aperture in the primer recess, wherein the groove is adapted to receive a polymer overmolding;

    a polymeric single piece body extending from a projectile aperture to a neck region that transitions to a shoulder region that extends to overmold the primer insert, wherein the polymeric eesingle piece body extends over the coupling element into the primer flash aperture and into the groove to form a flash hole;

    a propellant chamber defined between the primer flash aperture and the projectile aperture;

    a primer inserted into the primer recess;

    a propellant at least partially filling the propellant chamber; and

    a projectile frictionally fitted in the projectile aperture.

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