I am building my 223 AI and I noticed today that the action screws on just a tiny bit loose to the barrel. My barrel is a brand new cbi. Has anyone ever noticed this? Is this common? It isn't loose to the point where I feel it will slip or anything but, it does have just a tiny bit of wiggle in it until it gets screwed down quite a ways. This obviously dissapears when the barrel nut it tightened down to a rock solid state. Maybe I am worried about nothing. I just seem to get a bit nervouse when anything related to safety is involved. I guess I was just wondering if this was common. This is only my second build. My first build the action and barrel tolerance was so tight it barel screwed on.