Polymer-based cartridge casing for subsonic ammunition

Abstract

A high strength polymer-based cartridge having a first end; a neck disposed at the first end and a shoulder disposed below the neck to form a bottleneck cartridge. A second end is opposite the first end and an insert is engaged to the second end. A propellant chamber is formed between the shoulder and the insert and has a volume. An extension extends from the neck opposite the shoulder and a cap is formed on the extension, partially sealing the propellant chamber.

What is claimed is: 
     
         1 . A high strength polymer-based blank cartridge comprising:
 a first end;   a shoulder disposed approximate the first end;   a second end opposite the first end;   an insert engaged to the second end;   a propellant chamber formed between the shoulder and the insert and having an unobstructed and a reduced volume;   an extension extending from the shoulder opposite the insert; and   a cap formed on the extension, partially sealing the propellant chamber,   the reduced volume is reduced in comparison to a propellant chamber of a standard cartridge.