Patent ID: 8695260

Claim:
A modified M16 rifle or M4 carbine, comprising: a bolt having a maximum outside diameter (K in FIG. 3C ) greater than that of a standard M16/M4 bolt (existing M16A1-A4 versions and M4 and M4A1 versions); an ejector carried by the bolt; a bolt extractor pivoted to the bolt and having a maximum width (F in FIG. 4D ) greater than that of a standard M16/M4 bolt extractor (existing M16A1-A4 versions and M4 and M4A1 versions), wherein: the bolt, the ejector, and the bolt extractor operable to: transport a cartridge from a magazine to a barrel, and eject a spent cartridge from the barrel, a length of the cartridge is equal to or slightly less than 2.26 inches, and the cartridge comprises: a case having a case head diameter greater than 0.378 inch; and a bullet having a diameter greater than or equal to 0.224 inch; a barrel extension configured to receive the bolt; a standard M16/M4 upper receiver (existing M16A1-A4 versions and M4 and M4A1 versions) coupled to the barrel extension; and a standard M16/M4 lower receiver (existing M16A1-A4 versions and M4 and M4A1 versions) coupled to the upper receiver.