As I understand, the actual manufacturer of the PSA branded uppers and lowers is Anderson and they make lowers and uppers for a lot of different companies. I see no reason to be concerned. You can build a complete PSA AR for what, $400 to $450 ? Jeez, I just looked at HK MR 556's for giggles......$2,500.00'ish. That's at least 5 PSA AR's. The HK is a cool piece, but the pencil ran out of lead in a hurry when trying to justify sinking that much money into one rifle.
If you are concerned about PSA lowers, buy Aero Precision;
<p class="p1"><span><strong> Aero Precision AR-15 Stripped Lower Receiver, Gen 2 - Anodized Black</strong></span></p> <p class="p1">The <strong>Aero Precisio</strong>n AR15 Gen 2 Stripped Lower Receiver is the ideal base for any custom AR15 build. Machined to mil-spec dimensions, the Aero...
e-arms.com
I have seen them at E-Arms for as low as $56.00 each.
Personally, I can't see spending exorbitant amounts of money on all the high speed/low drag expensive Do-Dads. I just want a utilitarian rifle. I wouldn't baby it, nor would I abuse it. I'm pretty confident it would hold up just fine over time.