Method of making a polymeric subsonic ammunition cartridge
First Claim
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1. A method of preparing a polymeric subsonic ammunition comprising the steps of:
- providing a substantially cylindrical primer insert comprising a base having a top surface opposite a bottom surface, a substantially cylindrical coupling flange that extends from the top surface, a primer recess in the bottom surface, a flash hole aperture positioned in the primer recess extending through the bottom surface, a flash aperture groove positioned in the primer recess around the flash hole aperture, and an extraction flange positioned about the circumference of the bottom surface;
forming a polymeric middle body by molding at a first end a first polymer composition over the substantially cylindrical coupling flange into the flash hole aperture and into the flash aperture groove and molding a second end comprising a neck coupling region, wherein the first polymer composition extends from the neck coupling region to the flash aperture groove to form the polymeric middle body to form a propellant chamber having a propellant chamber volume;
forming a polymeric bullet-end component from a second polymer composition, wherein the polymeric bullet-end component comprises a polymeric coupling region opposite a bullet aperture separated by a neck region;
positioning a propellant chamber insert in the propellant chamber to reduce the propellant chamber volume by between 25 and 80% to a subsonic propellant chamber volume; and
coupling the neck coupling region to the polymeric coupling region to form a subsonic propellant chamber from the bullet aperture to the primer flash hole aperture.
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Abstract
The present invention provides a method of making a subsonic ammunition cartridge having a polymeric casing body having a generally cylindrical hollow polymer body having a body base at a first end thereof and a mouth at a second end to define a propellant chamber; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber, wherein the propellant chamber has an internal volume that is between 25 and 80% less than the open internal volume of a standard casing of equivalent caliber; and a primer insert positioned in the body base and in communication with the propellant chamber.
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Citations
17 Claims
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1. A method of preparing a polymeric subsonic ammunition comprising the steps of:
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providing a substantially cylindrical primer insert comprising a base having a top surface opposite a bottom surface, a substantially cylindrical coupling flange that extends from the top surface, a primer recess in the bottom surface, a flash hole aperture positioned in the primer recess extending through the bottom surface, a flash aperture groove positioned in the primer recess around the flash hole aperture, and an extraction flange positioned about the circumference of the bottom surface; forming a polymeric middle body by molding at a first end a first polymer composition over the substantially cylindrical coupling flange into the flash hole aperture and into the flash aperture groove and molding a second end comprising a neck coupling region, wherein the first polymer composition extends from the neck coupling region to the flash aperture groove to form the polymeric middle body to form a propellant chamber having a propellant chamber volume; forming a polymeric bullet-end component from a second polymer composition, wherein the polymeric bullet-end component comprises a polymeric coupling region opposite a bullet aperture separated by a neck region; positioning a propellant chamber insert in the propellant chamber to reduce the propellant chamber volume by between 25 and 80% to a subsonic propellant chamber volume; and coupling the neck coupling region to the polymeric coupling region to form a subsonic propellant chamber from the bullet aperture to the primer flash hole aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification