Jul 1, 2025

US12345491 - Diverging central bore for firearm sound suppressor

An apparatus and methods are provided for a front plate having a diverging central bore for firearm sound suppressors that improves noise and flash characteristics during firing a weapon. The central bore is disposed between a back surface and a front surface of the front plate. An untapered portion of the central bore extends from the back surface to a diverging portion that opens toward the front surface. The diverging portion includes a curvature profile configured to allow for more controlled expansion of high-pressure propellant gases exiting of the suppressor through the central bore. The curvature profile provides an included angle of the central bore that decreases secondary flash events accompanying the expulsion of propellant gases accompanying a fired bullet exiting the suppressor through the central bore. The curvature profile exhibits a cross-sectional area of the central bore that is proportional to a distance along the diverging portion.

Assignee: SureFire, LLC
Inventors: Barry William Dueck, Michael Scott Standen, Eric Hung Leung Chow, Ryan Steven Glasby, Doug Lawrence Stefanski
Filing date: 2022-11-18

firearmsuppressornoise reduction

The patent describes a front plate for firearm sound suppressors featuring a diverging central bore designed to enhance noise reduction and minimize muzzle flash during firing. The innovative curvature profile of the bore allows for controlled expansion of propellant gases, thereby decreasing secondary flash events associated with the discharge of a bullet.

Claim 1

A front plate for a suppressor for coupling with a muzzle end of a barrel of a firearm for reducing muzzle blast and eliminating muzzle flash, the front plate comprising: a central bore disposed between a back surface and a front surface of the front plate; a converging portion of the central bore extending from the back surface wherein the converging portion extends from a backmost surface of the front plate and meets a diverging portion within an interior of the central bore wherein the backmost surface is disposed proximal of the back surface by an offset distance; and the diverging portion of the central bore opening toward the front surface wherein the front surface encloses the central bore; a recess disposed away from the central bore and between an outer lip and the central bore. a central bore disposed between a back surface and a front surface of the front plate; a converging portion of the central bore extending from the back surface wherein the converging portion extends from a backmost surface of the front plate and meets a diverging portion within an interior of the central bore wherein the backmost surface is disposed proximal of the back surface by an offset distance; and the diverging portion of the central bore opening toward the front surface wherein the front surface encloses the central bore; a recess disposed away from the central bore and between an outer lip and the central bore.

Google Patents

https://patents.google.com/patent/US12345491

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12345491