I’ve also bought a psa lower then a psa upper & they match up. I recommend buying PA 10’s. Their price point Is attractive ($480-$500 wow). Now will It function for you right out of the box? I don’t know. But i do know for a little extra $ you can get a decent 308 for total $600?? That beats anyone anywhere (If your willing to work with it)
I have bought 4- pa 10’s from PSA. Yes their buffer system is odd. I changed out the buffer spring on most & went with a heavier buffer. No problem. For $480 delivered for a complete 308 i cannot complain. $50-$60 more & I have a great rifle. I of course change out the gas block for an adjustable ($40 at lj’s) run a heavy AR15 buffer then change out the spring to a flat wire. I also changed out the gas tube. They use ar15 gas tubes which are 1/4” shorter. I also changed out the delta for a free float rail. My friend uses his the way it came from factory & it works fine. Mine however have lighter recoil from the changes that have been made. (Also I believe i could get one to work as is from psa but i want lighter recoil therefor the mods)