Okay. I may be over thinking this but here it is. I have a 762SD awaiting approval and a 7.62x39mm AR15 with a carbine length gas system, external piston and a foot of barrel and suppressor between the gas port and the suppressor outlet. AAC assured me that the suppressor bore was big enough for the 7.62x39mm bullet but did not give an exact bore diameter.
Now for the paranoia: I think I am at a risk of an end cap or baffle strike because of the short carbine gas system starting to actuate The piston before the bullet exits the barrel, add the 6 inches of barrel after the gas port and the 6 inches of suppressor the bullet passes through all of which is moving as the rifle cycles.
Now why I think it is just paranoia: Aren't integrally suppressed AK's like 5 inch barrels with (I'm guessing) 8 or so inches of suppressor tube before the outlet? Surely the bullet exits the suppressor before the gas system starts the cycling sequence?
Personally I think it will be just fine but with a $1500 investment riding on something just for fun, I'd rather be safe than sorry. (Just for fun because the suppressor is mainly for the Savage 10 and the x39 AR is for S&G)