Does anyone know the best place to get a sbr upper?

The only place I have seen is dirent from manuf.

You can find a dealer HERE.

I ordered the carbine 16"  directly from Faxon though.

The locator can be a bit spotty sometimes... We are working on a new website to fix it.

Send us an e-mail and we would be happy to direct you to someone in the area who can get you set up!

Joglee

Any reason you want to purchase from a dealer rather than direct from the manufacturer?

I ordered my 12.5" barrel combo direct from Faxon and had it in my hands within 2 weeks of my ordering it (had to be manufactured).

Any local dealers to me that stock ARAK-21's only seem to have 16" barrel sets (which they are out of stock of) unless I wanted them to do a special order which would not save me any money.

It was actually cheaper to order direct with shipping than to purchase locally with sales tax (9.5%).

Faxon is fabulous to deal with both with your initial purchase and if you encounter any problems, they actually understand what customer service means compared to other firearms manufacturers.

Close to pulling the trigger on a 12.5" combo also.  Did you get 7.62x39?  Post the bolt face?  Seems to me a likely big upgrade over traditional 7.62x39 barreled ARs.