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Quick barrel change firearm

  • US 9,228,786 B2
  • Filed: 01/13/2012
  • Issued: 01/05/2016
  • Est. Priority Date: 01/14/2011
  • Status: Active Grant
First Claim
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1. A firearm comprising:

  • a bolt carrier;

    a backbone configured to guide the bolt carrier;

    a lower receiver within which the bolt carrier is at least partially disposed, wherein the backbone is removably attached to the lower receiver;

    a barrel latch attached to the backbone;

    a barrel configured to disengage from the backbone when the barrel latch is pushed;

    a trigger block assembly configured to drop into the lower receiver;

    a gas piston having a plurality of piston rings configured to only rotate substantially in unison with one another, wherein the gas piston is configured to move the bolt carrier when a cartridge is discharged;

    a metered gas port disposed out of the barrel for metering gas from the barrel to the gas piston;

    a spring guide having a main spring disposed thereon for biasing the bolt carrier in a forward position;

    an anti-bounce weight at least partially contained within the spring guide;

    a bolt carried by the bolt carrier;

    an extractor attached to the bolt;

    two springs disposed within the bolt for biasing the extractor toward a closed position of the extractor;

    a bar inhibiting separation of the lower receiver and the backbone when the main spring is compressed;

    a firing pin disposed within the bolt;

    a takedown lever configured to inhibit separation of the backbone and the lower receiver, the takedown lever having a safety lock pin to inhibit inadvertent movement of the takedown lever;

    a charging handle configured to move rearward to move the bolt carrier from a closed bolt position to an open bolt position;

    a dust cover configured to open partially to allow the charging handle to move rearward and to block bolt release from open bolt position until the cocking handle has returned forward;

    a gas port flash suppressor configured to guide the barrel during mating of the barrel to the backbone; and

    a stock having a handle formed therein, wherein a projection is configured to inhibit vertical movement of a stock; and

    at least one of;

    a firing pin retaining pin configured to facilitate removal of the firing pin and configured to transfer forward movement of the bolt carrier to the firing pin to cause a cartridge to fire; and

    /ora hammer assembly disposed within the lower receiver and having a hammer and a link with one end of the link attached to the hammer and another end of the link attached to the lower receiver such that the hammer has a rearward position that is below the bolt when the bolt is in a rearward position and the hammer has a forward position where the hammer strikes the firing pin when the bolt is in a forward position and wherein the link is configured such that the hammer has sufficient throw to travel over a last round stop as the hammer moves from the rearward position to the forward position wherein the link, not the hammer, has notches actuated by a trigger motion.

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