If your going to run AM jugs look for the larger transfer ports as stated. Most just dont have it and in fact are smaller. They are more suited to low rpm use.
I seen bb jugs free porting 0.1 not a miss print, and the builder never noticed it lol. Seems to matter little on bb jugs.
Most of them pull the piston top off. Flat floor. Fix them or grenade them, your choice. Most ports layouts suck. Intakes are all over the map along with the "ring of death."
If I offered you a ported AM jug would you buy one?
Seems guys might want them now. I'm done testing them. Some are better than others.