This is just my opinion, so take it for what it's worth:
First thing, the rail is suspect to me, it has a similar description and material list as the $65.00 ones I put on my .22 PCC and builds I don't intend to keep. Like this:
https://www.joeboboutfitters.com/Mat...ot-mlok-15.htm (Although someone on the third shitter down told me that CMT was their source for these)
The upper receiver is arguably just as important to repeatability and accuracy as is the barrel. If you think a Aero Precision upper is suspect, then why would you even consider an upper using an Aero Upper? Note: I'm in the camp that understands that Aero is an OEM Mfg and think they are GTG - according to ATF they manufactured at least 143,000 receivers in 2020). I've built couple rifles using Aero receiver sets, in 5.56 and .308, I don't see any problems with them, so as far as I'm concerned, like I said, they are GTG.
Anyhow, the Roscoe barrel is a high quality from what I've experienced, I have a 13.7" stainless and it is definitely an accurate barrel.
Here's a retail cost breakdown:
Aero upper: $94.00 (Optics Planet/Midway USA
Expo Arms Patrol Upper: $100.00 (Primary Arms)
Roscoe 16" Mid-Length: $156.00 (Roscoe)
Roscoe Gas Tube: $15.00 (Roscoe)
A2 Flash Hider: $8.00 (BCM)
So, at $373.00 retail for the build components, $349.00 seems reasonable when you add in the cost of keeping the lights on to what PA probably pays for the parts.
To me the rail would be the suspect component for a hard use duty or self-defense rifle, okay for a range toy.