Honestly I've never looked at one closely enough to see how the barrels are attached. I would imagine they're made similarly to the Mark I/II/93R's which are a pressed and pinned fitment. You would need to push out the two pins and then come up with a means to press the barrel out through the action from the rear with the bolt removed.
IIRC the newer A-Series and B-Series rifles both utilize barrels that are threaded into the receiver and secured with a smooth nut like the 110 and Axis centerfire rifles.
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