SeniorSpaz87

the big thing with both of them is the protrusion for the airline input (which the jack doesn't have), but aside from that if it'll fit a standard aeg cylinder+head it'll fit either.

if memory serves the profile for the protrusion is about 5mm*5mm.

Afaik its more than just that. The shell I have printed fits the F1 just fine theoretically. I sent it off to the shop to have an engine installed in it, they say the F2 doesnt fit and want to know if I want to just buy a F1. Id much rather go with an F2 but dont know the sizing differences, and I dont really want to have them send the gun back to me for me to do that hopefully simple meausrement and then send it back to them.

indeed it is, my memory failed me- the solenoids extend back further than the cylinder.

if you're going for accuracy then definitely put the work in for the f2, the open bolt systems (jack, f1) just can't deliver the goods (they basically have an air-leak by design).

sadly i can't help with proper measurements, gave up on the hpa a while back now.