Ive been slowly, (really slowly) getting all my parts and tools needed for my build. I got a PTG dbm (excellent product, terrible CS), but they sent me no instructions and even after I called them, they didn't give me any specs for spacing the DBM from the action to get proper feeding.

Ive played around with it and it seems that there is some space between not feeding and the magazine not seating so I assume it doesn't have to be super precise. Regardless, im not going to butcher my McMillan a5, bed it, and figure out it is wrong.

I thought what might be a good idea is to tighten the dbm small amounts at a time until the mag barely clips in and then loosen it back a turn or two to allow function if any dirt or debris gets in there. Id use a plastic tube from a pen as make shift pillars while I'm constantly adjusting and then measure the end result for the aluminum pillars. I'll listen to you more educated folks first and see what the general consensus is first though.