I received my stripped $19.99 bolt carrier several days ago. I already had a spare firing pin, cam pin, and FPRP in my parts bin. I bought a Stag 6.8 bolt and needed a BC for my ARP 16" recon build, so this sale came at the right time for me.
The carrier came with a gas key, which is chrome-lined. I have no idea if it's a MIM key or not, and whether the fasteners are domestic or imported.
The one feature of note is the staking on the key. It is staked, but nowhere near as much metal displaced as on my LMT, BCM, Toolcraft 1B1B6 and Bushmaster BCG's. My guess is these carriers were placed on clearance because they did not pass muster with the staking. That's fine with me, as I can easily displace some more metal myself. For the price I paid, I am very happy, and this was another smoking deal from PSA.