My extractor wasn't extracting. At all. The gun would strip a round out of the magazine, load it, and fire it just fine. But it would leave the spent case in the chamber of the barrel. Did this 15-20 times or so, with only one single successful extraction in the mix. Does it with brass or steel cased, new or old manufacture. Took everything apart and put it back together, and finger loaded a spent case, and let the bolt shut on it. The cart was then jammed into the chamber so tightly that I needed to tap the bolt handle with a rubber mallet to get it to release. This leads me to believe the chamber might be miscut. Any thoughts?