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Polymer ammunition having a primer insert with a primer pocket groove

  • US 10,458,762 B2
  • Filed: 03/27/2018
  • Issued: 10/29/2019
  • Est. Priority Date: 11/10/2010
  • Status: Active Grant
First Claim
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1. A polymeric ammunition comprising:

  • a primer insert comprising;

    a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface;

    a coupling element that extends from the bottom surface, wherein the coupling element is adapted to receive a polymer overmolding;

    a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall;

    a primer flash aperture through the recess bottom that extends through the recess bottom, wherein the primer flash aperture is adapted to receive a polymer overmolding to form a flash hole; and

    a groove in the primer recess positioned around the primer flash aperture adapted to receive a polymer overmolding, wherein the groove extends at least partially over the bottom surface and the groove is adapted to receive the polymer overmolding at least partially over the bottom surface;

    a substantially cylindrical polymeric middle body extending about the primer insert, wherein the substantially cylindrical polymeric middle body comprises;

    a polymeric bullet-end coupling element at a first end opposite a substantially cylindrical polymeric coupling end connected by a propellant chamber, wherein the polymeric coupling end extends over the coupling element and into the primer flash hole aperture and into the groove to form a flash hole;

    a polymeric bullet-end upper portion comprising a bullet-end coupling element connected to the polymeric bullet-end coupling element opposite a projectile aperture adapted to engage a bullet;

    a propellant at least partially filling the propellant chamber;

    a primer inserted into the primer recess; and

    a projectile frictionally fitted in the bullet-end aperture.

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