GunClaims
Weekly firearms and ammunition patent grants.
Nov 18, 2025

US12474133 - Forend kit and firearm comprising components of the kit

A forend kit or firearm comprising same may include a forend and a gas tube. The forend has a mounting body and a hand-gripping body extending from the mounting body. A first portion of the gas tube extends from a first end of the gas tube to a central portion of the gas tube and a second portion of the gas tube extends from a second end of the gas tube to the central portion. The central portion includes an arcuate segment vertically offsetting the first portion of the gas tube from the second portion of the gas tube (e.g., a 180 degree curvature). The first and second portions of the gas tube may extend parallel to each other. A discharge gas passage of the gas block and/or the barrel may include a circumferential portion for allowing angular clocking between the gas block and the barrel.

forendgas tubefirearm

The patent describes a forend kit for firearms that includes a mounting body and a hand-gripping body, along with a gas tube featuring an arcuate central portion that allows for vertical offset connections to a firearm’s discharge gas system. This design enables the gas tube’s first end to connect above the barrel’s bore centerline axis, while the second end connects below it, facilitating improved gas management.

Claim 1

1 . A forend kit, comprising: a forend having a mounting body and a hand-gripping body extending from the mounting body; and a gas tube having a first portion, a second portion, and a central portion, wherein the first portion extends from a first end of the gas tube to a first end of the central portion, wherein the second portion extends from a second end of the gas tube to a second end of the central portion, wherein the central portion includes an arcuate segment, and wherein the first end of the central portion of the gas tube is vertically offset from the second end of the central portion of the gas tube for enabling the first end of the gas tube to the engaged with a discharge gas system of a firearm at a location above a bore centerline axis of a barrel of the firearm and enabling the second end of the gas tube to the engaged with the discharge gas system at a location below the bore centerline axis. a forend having a mounting body and a hand-gripping body extending from the mounting body; and a gas tube having a first portion, a second portion, and a central portion, wherein the first portion extends from a first end of the gas tube to a first end of the central portion, wherein the second portion extends from a second end of the gas tube to a second end of the central portion, wherein the central portion includes an arcuate segment, and wherein the first end of the central portion of the gas tube is vertically offset from the second end of the central portion of the gas tube for enabling the first end of the gas tube to the engaged with a discharge gas system of a firearm at a location above a bore centerline axis of a barrel of the firearm and enabling the second end of the gas tube to the engaged with the discharge gas system at a location below the bore centerline axis.

Google Patents

https://patents.google.com/patent/US12474133

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12474133