So...I was dissecting my G19 and realized it had a part that I never knew was there. A firing pin channel liner. I shined a light down there and saw that the top of it had copper crap on it. I don't know whether this is factory lubricant (The gun has about 10k through it so that would be impressive if it was) or some other crap that I should worry about. What do you think? Second question: How does one remove a firing pin channel liner? And finally, just out of curiosity, will a glock function without the firing pin channel liner? Thanks!