I have no idea what the manufacture is of this unit or its components. The upper was on a Bushmaster lower I got in trade. I'm keeping the lower. The barrel is marked SS 1-8. Comes with the bolt carrier group and charging handle. Barrel is threaded and has a Smith Enterprises brake threaded on. Unit is in very good condition however I have not fired it so I can't say as to function.
$375 shipped to the lower 48. Contact by email only.