well..... i dunno what to say.
I've installed the UTG today and the Ultimak M8 , both to 2009 vintage bell lifestyles Poly techs...... and they are both level, muzzle to chamber and parrallel to the receiver plane/bore center. I also checked and triple checked to make sure i wasn't missing something. I did have to slightly enlarge the UTG side hole to accomodate the ARMS 18 side screw i replace the UTG screw with in order to get the side to side level on the UTG.