I just got my MI drop in quad rail, installed it, and now I'm bummed because it's kinda sloppy. It felt a little loose at first and after I put my vertical grip on, it really felt loose. Rotates ever so slightly to the right and left(clockwise/counter clockwise)...I think the only reason it doesn't spin all the way around is the gas tube. The front cap(?) behind the A2 sight is kinda loose, but I'm not sure if it's that or is it because of the whole drop in thing. Is there a way to tighten things up or should I just try and return this thing?