13.9" Rosco barrel, mid length gas system, standard buffer. When doing the last round BHO test, it fails to lock open. Tried different magazines and replaced the bolt catch. Tried adjustable gas block, it just fails to extract altogether when reducing gas pressure. The only thing I haven't tried is heavier buffer, but I would think I need less mass not more. I am thinking the gas port is too small. Any other ideas?
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