“Simple standard upper receiver, machined nicely with all tolerances set to fit my lower and no issues running it. Aero makes good stuff for good prices.”
“It’s a quality piece at a reasonable price. Barrel fit was pretty good; it could’ve been a little tighter but that’s how tolerances goes from piece to piece. This is my overall go-to receiver nowadays when I can find them at a good price. You can’t go wrong with Aero Precision.”