Hello Newton. I love this gun, but the other day I got a failure to extract and a non-feed of a last round, out of about 200 rounds fired. Also, a discoloration on the outside of the ejected cases that has a twist to it, as if it had something to do with dirty blowback from the barrel. Never had this before. The gun probably has about 2500 rounds through it. Feeds anything. Just thought it might be time for a checkup. Thanks. G