ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,729, issued on Nov. 25.
"Firearms, systems, and methods for quick connection of a barrel to a firearm" was invented by Matthew Butcher (Rice Lake, Wis.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Firearms, components, systems and methods to quickly connect or remove a barrel to or from an upper receiver, the receiver including an elongated body defining a central bore and configured to receive a barrel of a firearm, a cam positioned within the receiver and oriented transverse the central axis where turning the cam locks a barrel into the receiver, and in aspects includes a spring which straddles the barrel and applies a force to a hand guard whic...