Yes, it is fine to use a bronze bore brush on your Luger. If shooting jacketed bullets use a solvent that will dissolve copper like Shooter's Choice or Hoppes #9. If shooting lead bullets and want to clean the action of the gun with little or no re-oiling, I high recommend Ed's Red that you can mix up yourself. Do a google search and you will get the whole story and how to make and use it. I find it works great in Lugers.
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All my C&R guns are shooters
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