Originally Posted by
Sensei
Supposedly. Although discolor is probably a better term than damage. The DW manual states the following in regards to cleaning supplies, “High-quality cleaning solvent (barrel only). Solvents can discolor your Duty Finish. Kroil is also recommended and Duty Finish safe. Oil based cleaner (polymer safe) for the rest of the gun. High-quality gun oil *such as FP-10, Militec-1 or Dan Wesson Rail Lube. We do not recommend the use of Rem oil, CLP or Hoppe’s elite gun oil on the rails of our firearms.”
There is some online debate about BreakFree’s safety, but enough posted pictures of discolored finishes that I’m inclined to stay away since DW specifically mentions it.