Not a heck of a lot of info out there on these... kind of frustrating. So I can't base judgement on other info.
So I am going to base some of my comments on my "similar" experience with a SAI M21.
Armalite makes fine products.
I am very comfortable Armalite can produce a tack driver of a AR10. They certainly have a TON of experience producing AR10's.
Now for my useless info...
My SAI M21 experience.... decades ago, my holy grail 308 was a M21. The OEM price was crazy high to me, and the availability of that specific model was horrible.
And I really wanted that model of a M1A. I mean it was the best sold by Springfield Armory ?!
My desires were fruitlessly left unfulfilled.
On a fluke ....I walked into a LGS and up on the wall was a used one. I was shocked, and put it on layaway immediately. ( Poor working guy budget )
After I got it... I Cleaned the barrel and the damn thing does shoot. It was worth the price.
For the moral of the story.... that danged thing to shoot. Granted precision would drop off after 150ish rounds, but cleaning the gas system always put precision back to normal.
My M21 is so consistently precise, it taught me what I was doing wrong. If I didn't pull the trigger properly , I'd get a flier.... etc
And as a example of how finely tuned the M21 is , I swapped the hand guard to a vented one.. and accuracy went to poop. I looked at the OEM one... and it was "tuned" / "fitted" for the M21... ( inside ribs ground flat, and OAL trimmed to fit, with no pressure exerted on the front band and gas system. )
So SAI knows wth they are doing.... and I bet Armalite does as well.
I guess what I am saying is, I am glad I bought the best a company made ( like your choice ) It has never left me unhappy with the groups produced with ammo it liked. ( 168gr FGMM )
Your AR10 choice is the best Armalite makes. I'd bet... it will be a shooter. If I found one at your price... I'd probably buy it.
I'd take the leap of faith in the Armalite.
I let a GA Precision slip through my hands , and a Factory Rebuilt genuine Remington M24 also slip through my hands... arrgh.
I do have to ask... how good of a Large Frame AR shooter are you ? No offense intended at all , but Large Frame AR's are beasts unto themselves to shoot accurately.
And if the AR10 shoots like my M21 ( better I hope , Lol ), that will help anyone learn.
Also , my M21 has so exceed my expectations, I will never sell it.
Hopefully your SASS Gen II will be the same for you.
So don't expect to be able to shoot sub moa out of the box , if you aren't familiar with Large Frame AR's.
This thread has useful info...
https://www.snipershide.com/shooting/threads/driving-gas-guns.6982373/
As always YMMV.