There are very few people that can disassemble a Luger magazine and put the pin back in where it shows no evidence of being removed and installed. I agree with MauserLugers that I would leave it alone.
If your barrel is actually copper fouled, just a little brushing with a solvent and bronze bristle brush will not remove it. Even the copper solvents work very slowly. If after using a copper solvent the patches come out blue/green, you have copper fouling. The bronze brush will leave deposits of copper in the bore, so clean the bore thoroughly after brushing it and then apply the copper solvents. There are several compounds for removing copper fouling from the bore like JB's Bore Paste. It works agressively on the copper fouling, but will not harm the bore. Use it on a very tight patch and scrub the bore from the breech end forward, not letting the patch exit the muzzle. Run the patch back and forth 8 to 10 times, then clean the bore out with a solvent and inspect. Repeat as necessary.
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