I checked over the entire thing, the best I could, not being an expert on it, everything looked fine. I got home, went to install the charging handle... There are no threads on the inside of the hole for it to screw into. Not even on the other end of it. There's what looks like a nut, but unthreaded. Am I crazy? Assuming I'm not completely off the deep end, what should I do, contact Hi-Point? I doubt Dunham's Sports would give half a damn.