At least on my Gen3 18" PA10 the Warhammer will not allow the bolt to go into battery and lock up completely but enough for it to fire. Mangled casings with primers blown out. Something is out of spec and I have to assume it’s the Warhammer since the OEM and another extended ambi CH both work just fine.
I do have the Sledgehammer in my 10.5 suppressed AR15 with no issues so far.