US 2025/0137762 A1 · ANNULAR RIDGED POLYMER-BASED AMMUNITION CARTRIDGES

Abstract

A polymer cartridge includes an insert defining the base end and a body extending from the insert. The body forms a powder chamber which is in communication with a primer pocket formed in the insert via a flash hole formed through the insert top surface. A nose extends forward from the body and includes a shoulder that transitions into a neck defining a projectile aperture. An annular ridge is formed about the inner surface of the neck and positioned between the projectile aperture and the shoulder. The annular ridge is designed to engage the outer surface of a bullet that is the same caliber of the polymer cartridge. The bullet is designed with a groove corresponding to the location of the annular ridge so that the assembled cartridge is within the acceptable range for the total axial length thereof.

Claims20

Dependent claims

A polymer-based ammunition cartridge, comprising:

an insert forming a base end, the insert having a primer pocket defined through a bottom surface, a flash hole defined through an upper surface and in communication with the primer pocket, and a groove forming an extraction flange about an outer edge of the bottom surface;
a body extending from the insert to a forward end defining a powder chamber, wherein the flash hole fluidically connects the powder chamber to the primer pocket;
a nose extending from the body, the nose having a shoulder transitioning into a neck defining a projectile aperture;
and
at least one annular ridge formed about an inner surface of the neck between the shoulder and the projectile aperture, the annular ridge configured to frictionally engage an outer surface of a projectile configured to be loaded in the projectile aperture.

2 more elements

Dependencies are inferred from the claim text.

Annular ridged polymer-based ammunition cartridges

Life of this patent

Annular ridged polymer-based ammunition cartridges

Life of this patent

Abstract

Claims20