Which BCG?

Any quality, mil-spec carrier should work for you. Did you get a matched, headspaced bolt with your WOA barrel? If so, you've got tons of in-stock options from various sources, including WOA themselves. They also have complete BCGs in stock for ~$140 that are of very high quality should you need a complete BCG with bolt.

Aside from that basic advice...knowing what you want to spend and any particular features/upgrades/etc. you might want or otherwise think you need would help this discussion. Also, if you didn't get a matched bolt with the WOA barrel, I'd suggest that whatever bolt/carrier assembly you opt for that you check your headspace once you get everything together to ensure that everything is GTG.
 
18" woa barrel and a rifle gas system

I run a BCM auto carrier and bolt

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