Dwight,
You are correct that is will disolve copper. I always use it on 0000 steel wool, or a small piece of cloth. I use it only in a rust effected area, and immediately wipe it off and oil good as John S. stated. I did buy a decent Romanian .22 Training Rifle a few weeks ago and I put some Blue Wonder on a piece of cloth, wiped the entire action/barrel, and it sure brought the "luster" back to the bluing. Of course, I oiled it good after taking the Cleaner off.
With Lugers, I have always been veeeeery careful with any chemical, steel wool or bronze wool. Normally I try to use a cloth with oil to clean
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