Patent ID: 8677883
Filing Date: 2014-03-25
Classification: F41A

Abstract:
1. A rotary lug breech, comprising: a bolt carrier including a slot; a bolt at least partially positioned in the bolt carrier, the bolt comprises a plurality of breech studs; a receiver comprising a plurality of locking lugs, wherein one of the locking lugs comprises a cam section, wherein when releasing the bolt during an unlocking process, the cam section converts a releasing motion into a screwing motion to release a cartridge from a cartridge chamber using the bolt, wherein during the screwing motion, a first stud surface is supported on the cam section, during a locking process, the first stud surface engages the cam section to perform a pre-control process that rotates a control pin in the slot of the bolt carrier from a releasing position in which an advancement of the bolt carrier exerts substantially no torque on the bolt, to a control position in which a first slot surface of the slot interacts with the control pin, when the bolt carrier moves forward with the bolt during the locking process, the bolt carrier exerts a torque on the bolt to convert linear motion of the bolt into a locking motion via a screwing motion in which the bolt and the bolt carrier move relative to one another.