Jun 23, 2026

US12663228 - Ammunition magazine with asymmetric feeding

This disclosure describes systems, methods, and apparatus for a magazine assembly for a firearm, the magazine assembly comprising: an elongated housing, a spring positioned in an interior of the housing, a first and second plate at a proximal end of the housing, at least one follower configured to support one or more cartridges and move or slide within the housing based on a compression and decompression of the spring, one or more feed lips positioned at a distal end of the housing, the one or more feed lips adapted to prevent upward movement of a topmost of the one or more cartridges until a bolt or slide chambers the topmost of the one or more cartridges, and wherein the topmost cartridge is arranged off-center from the bolt of the firearm so as to increase an engagement or overlap between the bolt and the topmost cartridge.

Assignee: Magpul Industries Corp.
Inventors: Nicholas Kielsmeier, Libardo Jimenez
Filing date: 2024-09-06

ammunitionfirearmmagazine

The patent describes a magazine assembly for firearms featuring an elongated housing with an asymmetric design that allows for improved cartridge engagement with the bolt. This configuration includes a spring, a follower for cartridge support, and feed lips that prevent premature cartridge movement until chambering occurs.

Claim 1

1 . A magazine assembly for a firearm, the magazine assembly comprising: an elongated housing comprising a proximal portion toward a proximal end and a distal portion toward a distal end, wherein the distal portion is configured to be inserted within and to engage with a magazine well of a firearm and wherein the proximal portion is narrower than the proximal portion; a first plane bisecting the distal portion; a second plane bisecting the proximal portion and passing through a centerline of a topmost cartridge, wherein the first and second planes are parallel but offset from each other; a spring positioned in an interior of the elongated housing; at least one follower configured to move within the elongated housing based in part on a compression and decompression of the spring, and wherein the at least one follower is configured to support one or more cartridges; one or more feedlips positioned at the distal end of the elongated housing; and wherein the centerline of the topmost cartridge is in a second plane that is parallel to and laterally offset from the first plane. an elongated housing comprising a proximal portion toward a proximal end and a distal portion toward a distal end, wherein the distal portion is configured to be inserted within and to engage with a magazine well of a firearm and wherein the proximal portion is narrower than the proximal portion; a first plane bisecting the distal portion; a second plane bisecting the proximal portion and passing through a centerline of a topmost cartridge, wherein the first and second planes are parallel but offset from each other; a spring positioned in an interior of the elongated housing; at least one follower configured to move within the elongated housing based in part on a compression and decompression of the spring, and wherein the at least one follower is configured to support one or more cartridges; one or more feedlips positioned at the distal end of the elongated housing; and wherein the centerline of the topmost cartridge is in a second plane that is parallel to and laterally offset from the first plane.

Google Patents

https://patents.google.com/patent/US12663228

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12663228