Just noticed my Gunmetal p3's threading on the extension tube is sort of dark. Like the coating is actually inside on the threads. Its only like that on the bottom section, and when using it the IQ is affected. Is this normal for the Gunmetal version? Operates fine and I brought the IQ back up some after cleaning an some thread compound. But not as good when I dont use the section in question. Tested with all new batteries and the issue is the same its definitely the section with the coated threads bring down the IQ.