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some re-barreled guns that otherwise would be prohibited in Canada have threaded barrels, so they don't look as stupid with a longer barrel hanging out...
Advantages? Thread barrels are designed to accept a silencer (which are illegal here). You can buy/make a fake can but I don’t see the point….it just makes the gun longer and a lot heavier. if it's not real it's not cool
In Canada it would be to un-prohib a gun, like a G19 that is close to or just shy of the 106MM mark. The main reason in the US would be for a suppressor.
I know EFK has an option for a 1/2 inch extension and a 1/2 inch threaded extension.