I followed up with Montana Xtreme about this, here's what they said:I heard the guy that used to be the original owner is dead from that stuff.
I checked around to see if there had ever been some type of myth that would have caused your fellow shooter to say that. I have even checked with the ballisticians in the lab, and they have both been here for close to twenty years; using Copper Killer on a daily basis. Copper Killer was acquired in around 2005, not exact since I was nowhere near at that time. Your fellow shooter may have been either thinking of the Prop 65 warning that seems to be on many products just because California thinks it should be, or the fact that you need to have ventilation when using it. As one of the ballisticians/gunsmiths said when I asked, because of the strong ammonia smell, “you can’t stand to breathe in enough for it be harmful.” He also stated that there is nothing in the solvent to cause problems. If you would like me to send you a copy of the SDS for Copper Killer, just let me know. But, thank you for asking so you could get a clear answer.










