I have an SIS Custom that I picked up a couple weeks ago. I was having a problem with the first round not feeding (8 different mags). I adjusted the extractor tension (Took some out) and it was great for the next 400 or so rounds. Cleaned it and put in the safe. Took it out this morning and it was back to the feeding problem. Checked the extractor and it was tight again? Is it common for the tension to come back on its own, or maybe a bad extractor?