I bought a used C9 with one 8 round mag and two 10 round mags. First time out it functioned flawlessly. Well the second time was a different story. I kept getting FTF one after another. I was using Speer gold dot 124 gr hps, cci blazer 147 grain fmj, and federal 115 grain fmj. It seemed to do it worse with the speers, but it was failing to feed all three. What do I need to do to make it work?