Original barrels had the integral locking arrangement for the bolt locking lugs as part of the barrel. Rebarreled ones (except where maybe an original barrel was sourced and used) have short adaptors fitted for the bolt locking lugs to engage and then the aftermarket barrels are simply be screwed into the adaptor. The first model 44 aside from having the smaller bolt head pin had skinnyish barrels. The 44B had the larger locking pin and heavier barrels.
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