Firearm with quick coupling barrel system

摘要

A spring-loaded quick coupling barrel retaining system for a firearm. The firearm includes a receiver, a barrel nut, and barrel assembly rotatably mounted thereto. In one embodiment, the barrel assembly may include barrel locking lugs which rotatably engage and interlock with corresponding locking elements disposed on the barrel nut such as splines. The barrel assembly further includes a spring member forming a flexible interface with the barrel nut. The spring member self-tensions and tightens the lockup between the barrel assembly and barrel nut to promote a tight fit. Some embodiments may include a lock nut and a setting tool for adjusting the spring force to promote consistently proper lockup from one replacement barrel assembly to the next.

主权项

1. A firearm with quick-coupling barrel retaining system comprising:
a receiver defining a cavity that receives a reciprocating bolt; a barrel having a bore defining a longitudinal axis and an axial path for a bullet, the barrel having a forward muzzle end and rearward breech end; a barrel extension removably coupled to the rearward breech end of the barrel, the barrel extension including a plurality of barrel locking lugs extending radially outwards from the barrel extension, the barrel extension being rotatable between unlocked and locked positions; the receiver being configured to receive the barrel extension at least partially therein and supporting a plurality of splines configured and arranged to engage the barrel locking lugs; wherein when the barrel extension is inserted into the receiver and rotated into the locked position, the barrel locking lugs engage the splines to prevent axial withdrawal of the barrel extension from the receiver.