Rob,
The manual details the method of attechment of the barrel assembly to the breech ring:
The barrel is loose within the jacket. It has a flange at the end to prevent logitudinal movement, and two grb screws to prevent rotation within the jacket.
The jacket has an interrupted thread that corresponds with a similar thread inside the breech ring. The jacket and barrel (the barrel assembly) is inserted into the breech ring and turned 1/8th of a turn to engage the thread fully. A screw secures it in position , and a stop screw prevents the barrel from being rotated more than 1/8 of a turn.
Mike C
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