It was once thought that tightening up the carrier was a good way to fine tune the level 10 bolt, but it has since been found that you get more reliable operation by always using the largest carrier that doesn't leak. If you need to really fine tune the operation, then cutting down the longest spring is the best way to do that. Don't forget to remove the shims when checking for carrier leaks and operation. Once you get the mag running smoothly, then add shims to change how far the bolt has to travel before it vents air. Alot of us don't use any shims in our setups and have never had issues. You only need shims if the bolt stops on a breach blockage and won't vent to reset.
Originally Posted by commando7
If you crank the velocity up, you can't get the red middle spring to work?
If the in between shots don't properly reset, then you need a larger carrier.
Except for the Automag in front, its usually the man behind the equipment that counts.