I just received my dedicated upper this evening and of course I wanted to take it apart so I could clean it thoroughly before taking it out tomorrow. Well, after removing the collar screw, I just couldn't get the carrier, bolt, or charging handle out of the upper. The carrier will just absolutely not come out. It may move back about an eighth of an inch but then stops cold. I even tried getting it as far back as I could, then tap it out with a wooden dowel and a screwdriver, yet still nothing! Ideas or any help?!