Reusable Plastic Ammunition Casing

Abstract

A reloadable plastic ammunition casing is provided for firearm use. The plastic casing is preferably constructed from currently available polymeric materials using plastic injection molding techniques. In the preferred embodiment the casing includes a cylindrical body having a top portion and a bottom portion. The top portion having an open end for receiving a propellant and a top lip for retaining a projectile. The bottom portion has an internal casing floor that includes at least one concentric step down towards a centrally located primer pocket such that an installed primer is located in blast communication with the concentric steps on the casing floor. The concentric steps uniformly disburse, distribute, and deflect the heat and gas pressures within the casing when fired, thereby avoiding structural failure, allowing for multiple reloads of a casing constructed entirely out of plastic.

What is claimed is: 
     
         1 . A plastic ammunition casing comprising:
 a cylindrical body having a top portion and a bottom portion;   the top portion having an open end for receiving a propellant and a top lip for retaining a projectile;   the bottom portion having an internal casing floor, the casing floor comprises at least one concentric step down towards a centrally located primer pocket;   the primer pocket being arranged to retain a primer in blast communication with the casing floor; and   wherein the cylindrical body is injection formed as one continuous piece from a plastic material.   
     
     
         2 . The non-metallic ammunition casing in  claim 1 , wherein the top portion includes an internal shelf for seating a projectile. 
     
     
         3 . The plastic ammunition casing in  claim 1 , wherein the plastic material is selected from a medium group consisting of materials compounded from polyethylene, polypropylene, PET polyester, or poly carbonate. 
     
     
         4 . The plastic ammunition casing in  claim 1 , wherein the bottom portion further includes a ring around the exterior of the cylindrical body that is constructed and arranged to allow for extraction of the casing. 
     
     
         5 . The plastic ammunition casing in  claim 1 , wherein the plastic material is colored.