Ruger Mk I/II/III (and the 22/45) pistols also have 'interchangeable' barrels. They can be swapped without tools.
But... the receiver/barrel assembly must be purchased as a separate firearm. The receiver is the serialized part. (So, it's more appropriately described as having interchangeable grip frames.)
Browning Buckmarks can have their barrels swapped fairly quickly, with the use of a tool (hex driver and/or screw driver, depending on year of manufacture).
...It just takes a little longer to swap, and you have to buy the extra barrel separately. Unlike the Ruger Mk series, the Buckmark barrels are not serialized.
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