For those having FTEs, you just might want to check out and see how much garbage is in your extractor hook. I clean my weapons after every firing, when I do so I always use one of the AR15 style double ended brushes on the extractor. On my gun anyway, the brush and CLP was not cutting it. David Bowie checked my extractor tension on day 2 of the TDI class. It was in the marginally OK to OK range on the extractor tension. He then noticed a lot of build up in the extractor hook. I cleaned that out that night with a pick and the gun ran a very hard 542 rounds today with no problems at all. Well other than me sometimes not lining up the bumpy things on top of the slide or yanking the curvy thingy.