ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,437, issued on Jan. 13, was assigned to ENSIO FIREARMS OY (Sastamala, Finland).
"Multi-caliber firearm, a bolt and a barrel extension" was invented by Toni Karajamies (Sastamala, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A multi-caliber firearm includes a barrel extension configured to connect to an interchangeable barrel that is selected from at least two predetermined caliber sizes. An interchangeable magazine well receives a magazine that is selected to house cartridges from the predetermined caliber sizes. The magazine well includes a first end facing towards the stock and a second end facing towards the barrel extension. A bolt car...