Patent ID: 7937877
Filing Date: 2011-05-10
Classification: F41A

Abstract:
1. A method of manufacturing a firearm comprising the steps of: forming a right receiver shell portion; forming a left receiver shell portion; connecting the right receiver shell portion to the left receiver shell portion to form a receiver defining a receiver chamber; installing a reciprocating bolt in the receiver chamber; and connecting a barrel to the receiver, wherein the steps of forming the right receiver shell portion and forming the left receiver shell portion further comprise forming wall portions having flat areas having a first limited thickness, and forming a plurality of elongated rib portions having a second thickness greater than the first thickness on at least one of the shell portions, wherein the shell portion includes stress-concentration elements that are subject to the forces of recoil during firearm operation, and wherein a majority of the reinforcing ribs extend from the stress-concentration elements to anyone of another reinforcing rib or another stress-concentration element, such that weight is minimized while mechanical stresses arc effectively transmitted and distributed.