I noticed when watching Military Arms Channel video that when they push the rear takedown pin, his bolt carrier stays in place. Coupled on recent look at the manual, I see they also seem to show the BC staying in place. Mine is kinda springing out... just a tiny bit, but the tip always wants to nudge out. Doesn't seem to matter if I put the charging handle forward to leave it before the 'click'. To reassemble, I also gotta slightly push it forward before I'm closing it. Am I doing something wrong or missing a crucial (or not so) detent or something?