FIREARM WITH INTERCHANGEABLE BARRELS

摘要

A firearm system for readily interchanging barrels (108) capable of repeatable accuracy upon removal and installation of a given barrel comprising one or more barrels having an outer surface and an interior surface defining a bore aligned along a central axis. One or more barrels each has a receiver end for attaching to a firearm receiver (104). The receiver end is characterised by at least one set of large diameter, fine pitch threads (204) provided for threadable engagement on the outer surface of the barrel. A locking ring (114) is provided which comprises an outer surface and an interior surface aligned along a central axis, and having a set of threads (216) disposed on the interior surface for threadably engaging the fine pitch barrel threads. The locking ring is further provided with a series of lug recesses (214) disposed substantially circumferentially about the outer surface for engagement with a spanner (200) comprising a lug end (300) configured for conformably engaging a lug recess and the outer surface of the locking ring such that rotation of the spanner moves the locking ring to draw both the barrel bore and receiver into repeatable coaxial alignment following removal and replacement of said one or more barrels.