I recently acquired a used preban (1990) Benelli M3. So I finally fully strip it and there's a little rust on the internal parts. I've gotten all of it off the internal parts and there's still some rust on the mag tube. Any ideas on the best way to clean it? I've tried CLP and I keep turning towels yellow but there's still some rust on the mag tube. The rust runs all the way from the muzzle end to where it disappears into the gun.
Thanks in advance.
Thanks in advance.