If you're going to strip the gun for a service you could drop the barrel and cylinder into boiling water for about five minutes, believe it or not this will turn the surface rust black, you can then use fine wire wool to smooth things out before oiling.
All the best Mick
Top information, Mick.
Mmm......think I want a boiler for Christmas........er, erm, that's never going to sound right, is it?
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