Keltec RFB Suppressed

I have a keltec RFB Suppressed, how ever I am having several issues. I have the suppressor piston installed aswell.

1. Does not lock bolt back. With gasses all the way open.
2. Cycles, Eject, but it does.not chamber a round.
3. Cycles, ejects, chambers a round but I need to pushes the bolt forward to complete.
4. It won't cycle or eject the round
5. Jams up ejecting half way

I have cleaned the gun and lubricated. Using stock mag.