PSA stripped lowers?

[Doc45]

My son's Army unit did a group buy on stripped lowers from PSA with special engraving to commemorate this most recent deployment. He surprised me today with a belated birthday present of an Aero upper with free float barrel, Midwest mlok rail (minus the bcg/charging handle), an Aero lower parts kit and he's getting me one of the lowers when they get delivered to the receiving ffl.

I was truly speechless (quite a feat for those of you that know me lol), I have two wonderful sons thankfully. How is the quality of these lowers. I definitely will complete the build, just wondering as I don't really know anything about the PSA parts. I will shoot it and keep it handy as a defensive firearm. Thanks.

Here's a quickie pic of the upper: