1) Is it good practice to clean chrome-lined barrels with ammonia-based cleaners from time to time in order to remove copper residues?
Sometimes I've read: The ammonia gets through little cracks underneath the chrome-lining. There is supposedly copper. The ammonia removes the copper under the chrome. And then the chrome-lining flakes of over time. I doubt that's true. But I'm not sure.
2) What kind of cleaner do you use to remove copper residue from the barrel? It's not necessary to name a specific brand, the kind is sufficient (e.g. "ammonia-based"). In order to enable others to judge how good your cleaner works, it would be very nice if you add the following data:
a) Since how many years or shots do you use the cleaner?
b) What's the precision of your rifle (in MOA)?
3) After how many rounds do you clean the barrel with a copper remover?
4) Which cleaner is used in the US military for barrel cleaning? What kind of brush is used?
Cleaner is Break Free CLP, I assume.