Almost forgot... when you get to this bit in the instructions:
Originally Posted by Novak instructions
"*IMPORTANT* Before marking holes, check it insure rail is aligned with the trigger guard and the rail is not canted side to side. Some dust covers are not a perfectly radius, so visually verify that the rail is level side to side."
I get my best alignment by checking everything with a machinists square, a spirit level and a hole centering punch.
That is all,