Myth busters and ww2?

my grandfather used to tell me stories about how a Japanese samurai sword were so sharp that they could cut through a machine gun barrel. then i saw myth buster do a thing on it but they did it all wrong they heated the barrel up for 30mins then used a replica sword to try could a real samurai sword cut through one?
Update: well the fact that the gun barrels were constantly heated up and cooled over and over again would had made them very brittle so just heating the barrel up for 30min wasn't acurate
Update 2: forjj the samurai sword was slandered issue in the Japanese army all the officers had one
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