Patent ID: 9568261
Date: 2017-02-14
CPC Classifications: F41A

Claim:
1. A firearm having an upper and lower receiver subassembly and having a pivot pin and takedown pin wherein, the upper subassembly has lower walls having at least one inelastic, fixed, non-adjustable, machined in, raised projection embossment on the lower surface of the walls thereof to form a unitary body with the upper subassembly located within 50% of the length of the upper subassembly from a pivot pin and separate from a pivot pin mounting structure, said length being measured from the pivot pin to the take-down pin, the position, contact between the embossment and the lower subassembly and inelastic nature of the embossment provide a leveraged tension to enhance the fit of the upper and lower subassemblies when joined together.