I’ve had nothing but good luck with PSA. Never bought a whole rifle just bunches of parts that I put together and never-ever a problem.
As far as “You get what you pay for” I generally agree but an exception is with Toolcraft for BCGs. https://www.spicetac.com/Toolcraft-556-NATO-Black-Nitride-BCG/
Great quality AND dirt cheap lately. I use them on most of my AR builds, for ones I haven’t built yet and for spares.