Most helpful critical review
12 of 14 people found the following review helpful
on January 21, 2012
I agree with Mark Bennett. I've used both Gunzilla and Copperzilla (their copper cleaner) for a couple of years. Gunzilla does in fact do a good job of cleaning firearms and will take off light rust. BUT after the gun is left for several weeks with Gunzilla in the mechanism, it will start to gum up, and the gun must be cleaned up with another product. I use Break Free CLP for general cleaning and rust prevention, as does the military. Break Free, however, is not a very good cleaner for bores with copper deposits (see Copperzilla below). The good news is after a period of time Gunzilla will loosen rust in old guns like 75 year old Mausers, and make it easy to wipe it off. Another problem I've noticed is that Gunzilla will break down some modern plastic stock finishes like Remington uses on their new shotguns with wood stocks. It does not seem to harm the finish on oil-finished wood stocks. You will notice it makes some plastic finishes tacky very quickly and then dulls the finish by removing some of it. So, don't let it get on wood stocks with plastic finishes. For the same reason, however, Gunzilla does a very good job of cleaning plastic wad deposits out of shotgun barrels.
Copperzilla is another story. It is, in my opinion, the best bore cleaner out there to clean out copper deposits in gun bores. It is also very expensive, so I guess it should be. Just saturate a patch with Copperzilla, run it though the fouled bore, let it set for an hour, and you will be amazed at the copper, lead, and carbon deposits it takes out. I then wipe the bore clean with a dry patch, and run a patch saturated with Break Free through the bore for long-term storage. I also wipe down the gun exterior with Break Free. That combination seems to work very well, and prevents rust from forming during long-term storage. DO NOT get Copperzilla on aluminum pistol frames or nickel plating, and they warn of that on the bottle.