Maybe have a friend of yours who is used to recoil shoot it. I am not saying you were the cause but best to have someone else try it. I have an MK9 and it runs great. That does not mean your gun is without fault but the design is sound.
Glock 17, 19, 21, 26 X 2, 32 and 36.
Proud member of the PigPen. Embrace the Pignose.