Personally I think this barrel problem on any rifle is down to internal surface finish needing to be polished smooth by the pellets or some other polishing method to "run it in" It is virtually impossible to electroplate the inside of a tube unless it has the anode strung through the centre with a pumped electrolyte flow to provide the material to be deposited, do they really go to this trouble??
Electroplating would not improve the surface finish, any thing you have plated has to be polished to the desired finish before plating, scratches will not be filled or covered over.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.