# US 11,306,989 B2 · Devices and methods for extraction of high pressure cartridge casings

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- Number: US 11,306,989 B2
- Document ID: US11306989B2
- Status: Granted
- Kind: B2
- Application number: 16/995,395
- Filed: 2020-08-17
- Published: 2021-02-18
- Granted: 2022-04-19
- Earliest claimed: 2019-08-15
- Assignees: Vista Outdoor Operations LLC
- Applicants: Vista Outdoor Operations LLC
- Inventors: Bryan P. Peterson
- Web page: https://patentgrep.com/patent/US11306989B2

## CPC

- F41A 21/12: Cartridge chambers; Chamber liners (F41A3/74, F41A9/46, F41A21/04 take precedence)
- F42B 5/025: {characterised by the dimension of the case or the missile}
- F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

Devices and methods for chambering and releasing a high pressure cartridge case from a firearm. In some embodiments, a static chamber insert of high elastic modulus is disclosed. In some embodiments, a dynamic or adaptable chamber insert that radially expands in an out-of-battery configuration and radially contracts in a battery configuration is disclosed.

## Claims

### Claim 1

A gun barrel assembly, comprising:
a gun barrel formed of a material comprising steel and configured for firing a cartridge within a range from .17-.50 caliber;
a chamber at a proximal end of the gun barrel; and
a chamber insert affixed in the chamber, the chamber insert dimensioned to extend along a body of a cartridge case and terminate proximate a neck of the cartridge case accommodated and fired by the gun barrel assembly,
wherein the chamber insert defines an interior surface for interfacing the cartridge casing, and the chamber insert is formed of a material comprising one of a tungsten carbide, a tungsten heavy alloy, and a bulk metallic glass, and the material comprising an elastic modulus that is from about 60×106 psi to about 200×106 psi.

### Claim 2 (depends on 1)

The gun barrel assembly of claim 1, wherein the chamber insert is configured to accommodate and extract a cartridge casing comprising steel due to the chamber insert comprising an elastic modulus of about two to six times greater than the elastic modulus of the cartridge casing.

### Claim 3 (depends on 1)

The gun barrel assembly of claim 1, further comprising a cartridge casing formed of a material comprising steel,
wherein the elastic modulus of the chamber insert is from about two to six times greater than the elastic modulus of the cartridge casing.

### Claim 4 (depends on 1)

The gun barrel assembly of claim 1, wherein said gun barrel is shrunk fit onto said chamber insert.

### Claim 5 (depends on 1)

The gun barrel assembly of claim 1, wherein the chamber insert comprises a radial wall thickness that is less than one half of a diameter of a body portion of the chamber insert.