"But, when I read the specs. I'm pretty sure they had commercial buffer tubes."
And the problem with that IS???
There's a good selection of stock accessories which fit commercial tubes.
If you're not planning to use your AR as a club, spear, or prybar, it's HIGHLY unlikely, you'll have any issues with a commercial tube.
RE: BCA
I'm returning a BCA upper due to multiple problems.
1:does not chamber all types/brands of factory ammo
2: does not extract factory ammo that is chambered but not fired
3: after 25 rounds fired, bolt fails to fully cycle
I have used BCA barrels on a couple of "chore gun" builds which turned out well enough but have little confidence in their overall QC.
There's "economical" and then there's "cheap".