Patent ID: 6681677
Filing Date: 2004-01-27
Classification: F41A

Abstract:
A method of reconfiguring a firearm receiver system for receiving ammunition from a magazine and from an ammunition belt, comprising:providing a substantially as-manufactured OEM lower receiver assembly configured for having an OEM upper receiver assembly mounted thereon and for having an ammunition magazine attached thereto for supplying ammunition to the OEM upper receiver assembly; detachably mounting a supplemental upper receiver assembly on the lower receiver assembly, wherein the supplemental upper receiver assembly is configured for having belt-fed ammunition and magazine-fed ammunition supplied thereto and wherein said magazine-fed ammunition is supplied through the OEM lower receiver assembly; and mounting an ammunition belt feeding assembly on the supplemental upper receiver assembly, wherein the ammunition belt feeding assembly is mounted completely on the upper receiver assembly and wherein the ammunition belt feeding assembly is configured for supplying ammunition from an ammunition belt to the upper receiver assembly.