I bought one at cmas time for about the same price, it was a pretty tight fit with the psa 223 barrel and seems to be just fine-especially 4 the price--- I did lap it, but it wasn't too badSota Arms has assembled uppers for sale thru tomorrow. Stopped in and picked up a couple today. Haven't used their uppers before but at that price...
On inspection did not see any obvious flaws or machine marks. Dust cover has very positive detent, forward assist works, charging handle and bcg slide in without issue. Have not attached a barrel or run the lapping tool yet. There is a bit of wiggle when attached to a PSA pistol lower. I'm out of town now and that's the only lower I have access to today.
$12 flat rate shipping.
I have no affiliation with this company, just passing it on.