I've got a 9mm 2011 sight tracker with Aftec extractor, that I've built. I've passed all the barrel timing tests, have the correct link in. But occasionally my bullet will feed ahead of the extractor( like 1 or 2 out of 100, and it keeps the slide from fully chambering the round obviously. I've only got one spring in the extractor right now, because it seems to not put as much pressure on the round and it seems to be more reliable right now. I know I'm close to having a 100% reliable gun, just needed to get this last little bit lined out. I'm running sti mags, with metal spacers, and tti followers and bases, they are tuned also. Help me out here fellas!