Well, digging up a 7 year old thread but I just bought a NEW black XCR-M /308 with competition length keymod and kinda shocked at the play/wobble between the upper and lower. Expected more from a $3500+ rifle .. over $4000 after tax and shipping in Canuckistan. I'd have just sent it back to Wolverine but waited a looooong time for this thing and wasn't keen on spending another $100 on shipping it back and forth .. for nothing likely I figure. I don't think it came from RA like this as Wolverine just puts them together as needed. You guys ever figure out an acceptable method to tighten this up besides tape on a rifle of this cost? Love the rifle, it's NON-Restricted and all but this poor fitment sure puts$ a damper on it and I can see it getting worse as the rounds put through it pile up.