I seriously doubt you've got a '21 that hasn't had either cylinder plated.

My '28 front barrel (the one that lunched itself) had been done twice, the top's been done once, the barrel that's fitted now has been done before (and it's a bit dodgy i.e. it's had a gentle seize) etc.

Don't forget to tell the platers what clearance you want, read Matt's thoughts here, second request down.
_________________
Please do not PM me technical questions, if you can't find it on the Forum start a thread