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Mk. II rifles (except the II**) have a very unusual breech thread. 3 t.p.i., left hand, modified buttress. The breeching was designed so that once the set screw was backed off, a barrel could be...

The barrel threads are left hand. After a hundred odd years, it might be necessary to clamp the barrel and receiver as would normally be done to break the barrel loose. I'll have to check, but I...