Dave Noreen is correct. With a 1900/1910 swap, you will need to machine out the barrel lug bite and install the bolt wear plate so that it mates with the locking bolt of a 1910 gun. Parker regularly did this on guns sent back for routine maintenance. Its not an amateur job, fitting barrels is a job for an experienced Parker gunsmith. Get the angles or fit wrong and you can tell from many feet away. The internet ads are full of them, maybe that's why they are there.
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