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There are new match grade 303 barrels from Criterion for No4s just coming out but they are $500 odd. Most 303s are now so stuffed that spending $500 to re-barrel makes no sense, you might as well...

Ask to see evidence it is a Parkerhale, ie the foresight on the LHS or knox should be stamped such or its a "copy". As a rule PH also tended to remove the original serial number and put their own 6...