ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,546,547, issued on Feb. 10.
"Firearm platform and method of connecting upper and lower receivers" was invented by Keith Berry (Hampden, Mass.) and David Moore (Hampden, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A firearm platform and method of connecting an upper receiver to a lower receiver. The upper receiver has a pivot lug and a takedown lug with perimeter openings in opposite directions. The lower receiver has a locking member that pushes against the takedown lug which causes the upper receiver to displace forward. As a result of the forward displacement, a pivot pin in the lower receiver exerts an opposing force against the pivot lug. T...