Has anyone seen a difference in accuracy between the gas blocks with set screw mounts vs. clamp on mounts? I read that the set screws create a pressure point what affects the barrel. Is that true?
There is no difference what so ever. You can't tighten a #10 screw enough to distort the barrel before it will strip either the socket head or the threads. I will say the clamp on style will seal the gas port better than the setscrew type.