May 12, 2026

US12624913 - Gun magazine spring state indication system and method

A novel system and method for determining when a magazine spring has exceeded a compressive set tolerance and needs to be replaced. The spring includes a visual indicator. The visual indicator is positioned so that it is visible beyond the bottom of the magazine tube when the follower and magazine spring are inserted into the tube and the follower is raised to its uppermost position. The visual indicator is not visible beyond the bottom of the magazine when the spring has exceeded its compressive set tolerance.

Assignee: Check-Mate Industries
Inventors: Brandon Vitulli
Filing date: 2025-02-05

gunmagazinespringindicator

The patent describes a system for indicating when a magazine spring in a firearm has reached a state of excessive compression and needs replacement, featuring a visual indicator that becomes visible when the spring is in an uncompressed state. This indicator is designed to be easily observed through the bottom of the magazine tube, providing a clear visual cue for users.

Claim 1

1 . A method for a user to determine when a magazine spring has experienced an excessive compressive set, comprising: (a) providing a magazine tube having an open bottom; (b) providing a follower; (c) providing a magazine spring, including, (i) an upper portion, (ii) an indicator region, having a lower boundary; (d) placing said follower in said magazine tube; (e) placing said magazine spring in said magazine tube, with said upper portion of said magazine spring being connected to said follower; (f) raising said follower and said magazine spring until said follower is arrested at an uppermost point in its range of travel, said magazine spring being in an uncompressed state; and (f) said user observing whether any of said indicator region extends beyond said bottom of said magazine tube, wherein said indicator region has a distinct color in comparison to a portion of said magazine spring lying below said lower boundary of said indicator region.

Google Patents

https://patents.google.com/patent/US12624913

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12624913