Jan 27, 2026

US12535307 - Firearm barrel

A firearm barrel has an elongated body defining a bore and defining a bore axis, the body defining a breech end and an opposed muzzle end, a chamber defined in the breech end and contiguous with the bore; the bore having an interior surface having a plurality of alternating lands and grooves, the grooves being surfaces separated from the bore axis by first radius, the lands being surfaces separated from the bore axis by second radius less than the first radius and the lands and grooves being straight elements parallel to the bore axis, such that no spin is imparted to a projectile propelled down the bore. The lands and grooves may extend from the chamber to the muzzle end. The bore may have a constant cross-sectional profile along its length.

Assignee: FRANKLIN ARMORY HOLDINGS, INC.
Inventors: Ryan Paul Fellows, Jay Leonard Jacobson
Filing date: 2025-06-10

firearmbarrelammunition

The patent describes a firearm barrel with a bore that features alternating lands and grooves designed to prevent spin on projectiles, ensuring a straight trajectory. This barrel has a length of less than 18 inches and includes a chamber that accommodates ammunition with a central primer aligned with the bore axis.

Claim 1

1 . A firearm barrel comprising: an elongated body defining a bore and defining a bore axis; the elongated body defining a breech end and an opposed muzzle end; a chamber defined in the breech end and contiguous with the bore; the elongated body having a length of less than 18 inches; wherein the chamber is sized to receive ammunition having a central primer registered with the bore axis; the bore having an interior surface having a plurality of alternating lands and grooves; the grooves being surfaces separated from the bore axis by first radius; the lands being surfaces separated from the bore axis by second radius less than the first radius; and the lands and grooves being straight elements parallel to the bore axis, such that no spin is imparted to a projectile propelled down the bore. an elongated body defining a bore and defining a bore axis; the elongated body defining a breech end and an opposed muzzle end; a chamber defined in the breech end and contiguous with the bore; the elongated body having a length of less than 18 inches; wherein the chamber is sized to receive ammunition having a central primer registered with the bore axis; the bore having an interior surface having a plurality of alternating lands and grooves; the grooves being surfaces separated from the bore axis by first radius; the lands being surfaces separated from the bore axis by second radius less than the first radius; and the lands and grooves being straight elements parallel to the bore axis, such that no spin is imparted to a projectile propelled down the bore.

Google Patents

https://patents.google.com/patent/US12535307

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12535307