Don't tell Markm or he will sell all of his off.
That is where PSA is playing with fire. If an uninformed buyer shows up, and starts throwing PTAC junk in the cart, they will get what they'd paid for: not much.
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I put a psa upper on a friends lower and got it sighted in for his gf, now wife. The thing has run fine, no high round count yet, but the fsb would not go down enough to sight in. I swapped the pin with mine which didn't have to go down as far, and all is good now, but the psa pin was not threaded correctly towards the top from what I can tell.
I think they CAN BE great but seems to be a lack of qa, so I'd definitely ensure function and reliability before trusting my life to it. Same as other guns, but I'd be a little more careful, not suprising based on price.
OP, good luck, chances are it will be g2g, just a guess.
Again and again we hear problems with the same areas. However, again and again people want to claim all barrels are the same.
For anyone who has a PTAC that works, that is fantastic. You take a gamble, you roll the dice, and perhaps you are one of the people who doesn't have a problem and get your thread deleted on the other board. I don't doubt for a minute that PSA doesn't make some acceptable gear, the personal issue I have is the QC which seems to rival that of Olympic Arms.
I pretty much built a PSA AR the same way as the OP, only I started with the PSA 16" Premium upper w/o BCG and charging handle. I believe it was $259.99 last November. Bought the same $129 lower in Jan of this year and an Aim Surplus Black Nitride BCG. The trigger on my lower is actually pretty good. Crisp and clean with a 6 1/4 lb pull.
Product description: 16" Chrome-lined, chrome moly vanadium. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a carbine-length gas system. The M4 profile barrel is high pressure tested and magnetic particle inspected and then phosphate coated. Barrel is finished off with an .750" diameter F-marked front sight base with sling swivel, standard handguards and an A2 flash hider. Barrel is made for us right here in SC by FN Manufacturing. Rollmarked "5.56 NATO 1/7 CL MP PALMETTO"
The only trouble I've had with the setup is the bolt. Extractor went South after about 400 rounds. I installed a BCM bolt rebuild kit, and all is well again.
I have 3 psa uppers, CHF & Wilson stainless barreled. They have never missed a beat. I have many friends that have psa uppers thar never miss a beat.
That was 4-5 years ago. As I recall there was some kind of feed/chamber issue. I wasn't able to fully resolve it, as I was also there to shoot. Unless your guns are malfunctioning now, I wouldn't worry.
The last issue I saw which was in 2014 was a carrier key that came loose at somewhere round 750 rounds.