Where to order small parts from?

[Red*Lion]

BCM hands down.

[JDH1]

My answer would have been different a year or so ago. Considering the times we are in now my answer is who ever has what I need in stock.

[DMTJAGER]

Total novice here but bought all my OH S**T it boke and all other parts per the recommendations I got here either utilizing a site sponsor or by asking or reading replies from very well regarded and trusted numbers.
All my small parts and BCG's I bought from:
BCM,
Bravo Co.
Primary arms
Brownells
CMMG

I might have bought from 1-2 others but don't recall using anyone else. No point in putting parts of unknown quality in a otherwise quality gun.