I wasn't going to post, probably shouldn't now but.....
Palmetto has 18 inch COMPLETE stainless uppers in 308 for $649 to 1000....they just had free shipping this weekend. Palmetto also has stripped lowers for $79 to $129....you will need a AR15 lower build kit for $45 from Anderson and 308 specific pins..about $14....you need an 308 specific buffer and spring unless you throw down for an adjustable gas block.
I'm not saying some people on here are giving you bad advice but....
You quote all these PSA parts and say you've researched it but I'm doubting that. You state that you'll need a lpk and a 308 pins ($14 pins). If building this PA-10 that you're quoting all these prices for, you'll also need a larger bolt catch and mag catch. Individually they cost $15, $15, $10 and $10 respectively or buy them as a kit and its $30, so you're just as well off buying the PSA PA-10 lpk for $80.
The reason you need to buy a matched upper/lower is because there is no standard. My Palmetto receivers do not mate up with my dad's Aero receivers. The Palmetto takedown pins are too large so the Aero upper doesn't fit. The Aero lower has a very high shelf so the rear take down pin on the Palmetto upper bottoms out too soon and you can't push the pin in. Doesn't work either way.
Even "throwing down" for an adjustable gas block doesn't remove the need for the propper buffer/spring. If you don't use the right setup, the back of your gas key will run into the buffer tube pretty violently. The PA-10 setup needs an Armalite length buffer tube (longer than AR-15 carbine), H1 AR-15 buffer (308 carbine buffer is too short), and a 27 coil 308 buffer spring (AR-15 carbine spring is too small). You basically need the largest of everything. Even on an AR-15 you try to run the heaviest buffer possible (reliably). Getting an adjustable gas block to choke the gas system and then trying to compensate by running everything light is not the way to go with .308.
I'm not saying that it appears you really don't have a clue but...
...just kidding, yeah I am.
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