GunClaims
Weekly firearms and ammunition patent grants.
Nov 11, 2025

US12467727 - Ammunition blank and corresponding bolt

An ammunition cartridge casing has a casing base with a proximal end surface, a casing body defining an inside volume, and a distal end portion. The casing base defines a primer pocket in communication with the inside volume of the casing body, where the primer pocket is sized and configured such that when a primer is installed in the primer pocket, a proximal face of the primer is recessed into the base at least 0.010″ with respect to the end surface. Blank ammunition made with the cartridge casing is configured for use with a rifle having a bolt with a boss on the breech face that corresponds to the recessed primer.

ammunitionblankcartridge

The patent describes a blank ammunition cartridge casing designed with a recessed primer pocket that allows the primer to be flush or slightly recessed, enhancing compatibility with specific rifle bolts. This innovative design aims to improve the functionality and safety of blank ammunition used in rifles.

Claim 1

1 . A blank ammunition cartridge casing comprising: a casing base with a proximal end surface; a casing body defining an inside volume; and a distal end portion, wherein the casing base defines a primer pocket in communication with the inside volume of the casing body; wherein the base defines an annular region extending radially outward from the primer pocket, the annular region recessed axially with respect to the proximal end surface by at least 0.014″, and wherein the primer pocket is sized such that when a primer is installed in the primer pocket that a proximal face of the primer is flush with or recessed axially with respect to a proximal surface of the annular region. a casing base with a proximal end surface; a casing body defining an inside volume; and a distal end portion, wherein the casing base defines a primer pocket in communication with the inside volume of the casing body; wherein the base defines an annular region extending radially outward from the primer pocket, the annular region recessed axially with respect to the proximal end surface by at least 0.014″, and wherein the primer pocket is sized such that when a primer is installed in the primer pocket that a proximal face of the primer is flush with or recessed axially with respect to a proximal surface of the annular region.

Google Patents

https://patents.google.com/patent/US12467727

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12467727