New gun chamber cleaning

[FNFbobcat]

Just polished my new Ruger 57 chamber. Removed a lot of brown gunk, which is probably either a preservative (Cosmoline?) or residue from the surface treatment. I have seen this same stuff on new Savage blued firearms, and think it may be related to Melaniting.
Break Free CLP alone will not remove all of it. I use Flitz paste on a rag wrapped around a brush. There was less in the bore.

[panzermk2]

This might explain someof the over pressure case separations. Of course all chamber cleaning for ANY 5.7 you should use carb cleaner. Not parts cleaner, not gun solvent, but carb cleaner that can remove the lacquer.


https://youtu.be/HPXXzrnaEek

[FNFbobcat]

I plan to use carb cleaner for routine maintenance (re: lacquer removal).

I can see where this virgin chamber gunk could have a higher coefficient of friction than bare chamber wall. It is very thick and sticky.