Cleaning Black Carbon

[imntxs554]

On 1 of my Carbines I shoot a lot it was starting to act up so I took it all down cleaned and replace the OS Sping as it was worn. I also took off the gas nut and piston and clean the port. The problem is I can't get that Black Carbon off the Piston that's baked on it. I was reading a good way to clean Baked on Black Carbon is to use copper. Before I use this will this cause any damage to the piston. I have several cleaners here that nothing has worked. I don't want to change it out cause the piston is marked and want to keep it on my Carbine. Any ideas. TIA

Frank

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