So I built an AR-V from the receiver set. Using the lightweight stainless PSA 16" barrel. It has been malfunction free since day 1. I installed a regular flat CMC trigger in it and put a holosun 510 on top. I've got right at 1,000 rounds through it so far. I have right at $1200 in it with the dot and trigger. I'm very happy with it so far.
-The throat length was pretty short on the barrel but PSA agreed to fix it for free and paid shipping both ways. Took less than a week to get it back.
-The bolt catch doesn't hold the bolt back securely enough. You can bump the gun with your hand and the bolt will go forward. Not an issue in USPSA but can be a bummer in IDPA if you are expecting to hit the bolt release but then release you need to rack the charging handle.
-The mags are great. I haven't had to clean them yet and they are dirt cheap. I have 5 of the PSA mags and i have had to do some light sanding to get them to all drop free(empty). They all dropped free with ammo in them. Magpul mags and factory mags have all been flawless as well.
I've been running a heavy AR9 buffer and standard carbine spring but will be installing a blitzkrieg buffer and trying that later today.