Have you turned up the velocity to a higher value? If it won't fire, even at the highest setting, then you haven't got enough pressure to overcome the force holding the bolt back. That is usually caused by bolt stick. Have you tuned the level 10? You will need the proper tension bolt stem by the carrier oring. If its too tight, it won't release the bolt. You want it adjusted so that it is using the largest carrier size that does not leak. Don't use any shims.
Except for the Automag in front, its usually the man behind the equipment that counts.