Automatic/semi-automatic rifle assembly for large caliber belted cartridges

  • US 10,330,410 B2
  • Filed: 09/05/2014
  • Issued: 06/25/2019
  • Est. Priority Date: 09/05/2013
  • Status: Active Grant
First Claim
Patent Images

1. An automatic or semi-automatic firearm assembly configured for firing a belted cartridge, the firearm assembly comprising:

  • a gas operating system for automatic action cycling;

    an upper receiver assembly configured for receiving magazine-fed belted cartridges and for ejecting spent cartridge casings through an ejection port;

    an elongate firing pin defining a central axis;

    an elongate bolt carrier having a central bore, a posterior end configured to interface the firing pin, and an anterior end configured to interface a bolt assembly partially disposed within the central bore, the bolt assembly operative with the firing pin and including a bolt and a bolt extractor;

    a bushing configured to interface the bolt carrier and limit travel rearward of the bolt carrier during automatic action cycling;

    a charging handle inserted into a distal end of the upper receiver assembly above the central axis, the charging handle slidable parallel to the central axis into the upper receiver assembly; and

    a barrel chamber having anterior and posterior ends for receiving the belted cartridge, the barrel chamber having a wall thickness between about 0.250 to 0.350 inches, wherein the barrel chamber includes a counter bore at its posterior end to interface the belted portion of the belted cartridge, and wherein the charging handle is configured to engage the bolt assembly for manual action cycling to position an initial belted cartridge within the barrel chamber.

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