Quote Originally Posted by nak81783 View Post
The Level 10 has a smaller surface area that the pressure pushes on to start the cycle, so it needs more pressure than a Level 7.
Also, if you are using a stiffer bolt spring, it requires more force/pressure to move the bolt forward.

RockoFTN: Go through the level 10 tuning procedure to make sure you are using the largest carrier that does not produce a leak. It is absolutely essential or you will get bolt stick at some point out in the field during a game.