Nov 3, 2026

US12782068 - Device and method for sealing a firearm gas key

A gas key gasket and method seals a firearm's gas system at the interface between the bolt carrier body and the gas key. In various embodiments, the gasket is metallic with an embossment at the gas hole. In embodiments, the embossment compresses and provides one or more contact rings at the interface. The contact ring(s) promote a method of sealing the irregular surfaces around the gas path, which provides a level of consistency to the seal.

Assignee: FN Herstal, S.A.
Inventors: Maxwell Reichard
Filing date: 2025-09-17

firearmgassealgasket

The patent describes a metallic gas key gasket designed to seal the gas system of a firearm at the interface between the bolt carrier and the gas key, featuring a ridge embossment that enhances the seal’s effectiveness. This gasket aims to provide a consistent sealing solution for irregular surfaces, improving the overall performance of the firearm’s gas system.

Claim 1

1 . A gas key gasket for a firearm, comprising: a monolithic gasket comprising a metallic material formed with at least one opening, wherein the gasket is further formed with a ridge embossment extending circumferentially around the at least one opening, whereupon the ridge embossment can be positioned about an opening in a bolt carrier of a firearm and compressed by a bolt carrier gas key so as to seal one or more irregular surfaces on the bolt carrier gas key and/or the bolt carrier. a monolithic gasket comprising a metallic material formed with at least one opening, wherein the gasket is further formed with a ridge embossment extending circumferentially around the at least one opening, whereupon the ridge embossment can be positioned about an opening in a bolt carrier of a firearm and compressed by a bolt carrier gas key so as to seal one or more irregular surfaces on the bolt carrier gas key and/or the bolt carrier.

Google Patents

https://patents.google.com/patent/US12782068

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12782068