US Patent 9347725 Semiautomatic rifle trigger mechanism

Methods and apparatus are provided for a semiautomatic rifle with a trigger in a receiver portion of the rifle positioned substantially forward of a back end of the rifle barrel, and a hammer assembly that includes a pivotally mounted sear, a disconnector, and a hammer mounted in the receiver behind the back end of the barrel. A hammer linkage proximate the hammer assembly has a first end connected to the trigger by a pull rod, and a second end configured to push a back end of the sear in an upward direction.