I'm sure it's a good one, I'm also sure it wasn't cheap.
Coatings are probably good but I don't see anything about being chrome lined inside the carrier? I'm trying out a coated Sionics and it seems real nice.
For rifle gas, you don't need a black insert, 5 coil spring or O ring on the extractor. Probably proven in your setup by now but some issues were reported with O rings and rifle gas just FYI.
It also doesn't say anything about being MPI'd AFTER HP testing.
See how things can get loose on mil spec? Not that any of this matters but hopefully you get my point.
Another point my buddy likes to make about mil spec is "low bid"...
