With some ammo I have some FTF. Taking a close look inside while slowly pulling back the slide, I find that the nose of the next round does not always fully pop up into position. As the slide goes forward, that rnd may jamb into the bottom of the feed ramp. Checking the mag, I find that occasionally all the rnds line up in such a way that the top rnd is not fully seated to the top. Operating the mag assist button very slowly upward would show this. True, a slight tap and all was fine. Some one suggested to me to remove the follower form the mag and change the angle at the top by taking a very small amount(1/32 in ) off the heal and nothing at the nose and. This slight angle change causes the nose of the rnd to fully spring to the top. There by more directly entering the chamber. It seems to have worked for me. Federal bulk and Amer. Eagle now runs much better. CCI was never a problem. Might be worth a try.