If it's brand new and this is the first time that you fired it. It may just need a breaking in period. When my Stag Model 3 was brand new I had some problems with it not extracting the fired case. After about 500 rounds I put a extractor upgrade kit and a "H" buffer into it and that fixed the problem, been able to run anything that I choose since. By putting the heavier buffer in it's my belief that it slows the bolt down just enough that the extractor can do it's job better.
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