I have six new USGI 30 round mags that I would like to dedicate to my SU-16. These mags still have the black follower. Does this make a difference in performance like it sometimes does in the AR15 where I use the green follower?
No... it's a question of how much the follower is allowed to tilt and possibly cause binding inside the mag body. The green followers have longer tangs keeping them from tilting. Doesn't matter what gun you stick 'em in.