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AEA AEA challenger terminator barrel measurements needed pls

Specifically .35 cal

Needing a little help here.. has anyone or can someone with a challenger or terminator in 9mm measure the OD and other specific dimensions pertaining to the breech end of the barrel for me??

So what I’m trying to figure is wether or not a barrel from one of these two guns would be able to interchange with my 13” barreled HP Max.. you know , longer barrel = more power, better efficiency!!
I’ve talked to Bin about this and he says they don’t make a longer barrel for the HP Max .35 cal.
However I’ve noticed the attachment method of the aforementioned rifles does appear very similar to the MAX.

Here are my barrels measurements for consideration

OD at breech
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