• US 7,827,722 B1
  • Filed: 06/16/2006
  • Issued: 11/09/2010
  • Est. Priority Date: 05/07/2002
  • Status: Active Grant
First Claim
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1. A rifle having an upper receiver carrying a bolt carrier and a barrel attached to the upper receiver, the rifle further comprising:

  • an operating system extending forwardly along the barrel and terminating in a barrel coupling including a piston assembly coupled to the barrel for receiving propelling gasses from the barrel, the piston assembly having a cylinder with an open forward end, a piston moveable between a retracted position and an extended position within the cylinder, and an end plug removably closing the open forward end of the cylinder to permit passage of the piston therethrough when the plug is removed;

    a tubular handguard having a forward end, a rearward end, a central void extending between the forward end and the rearward end, and a channel extending therealong adjacent the central void, the tubular handguard received about the barrel with the channel providing clearance for the operating system and the forward end being open to permit access to the barrel coupling and end plug of the operating system; and

    a barrel nut coupling the barrel to the receiver, and the tubular handguard encircling the barrel is received about and coupled to the barrel nut.

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