I've been absorbing AK kit build videos.
I think I found a process error Palmetto is making repeatedly.
They are pressing the things onto the barrel too far.
Both Marv and I had to shave off some material from the front of the "fitted" gas tube to get it removable without tools. This is because the gas block was pressed a tiny bit too far to the rear and the rebate was too deep inside the tube.
Marv's rifle has too much threaded muzzle in front of the front sight, a common complaint. I think that, this too, was pressed on too far. Marv's slant brake bottoms out on the muzzle before getting tight against the front sight base.