No it's not that. I use the carb cleaner all the time, it's great stuff but I thought a caution in order.. On the barrel carb cleaner is the ticket. I'm really slow, retired don't you know. Still it's hard for anyone to make a living gunsmithing. There aer only a few that make really good at it, only room for so many Turnbulls and Jarretts.. The average smith you need to take a brokem firing pin to is in dire financial straights.. I try to avoid these type jobs as the money is so poor. If I don't make something even a retired guy like me will go broke! Just a caution on the carb cleaner. I've used cases of the stuff but never used it on polymer framed weapon. Might want to test on a hidden place of just use mineral spirit on the polymer frames.