Hardened Arms

Anybody buy upper assembly from Hardened Arms or have done purchasing with them? How good are their upper assembly? Looking at the 7.62x39 since I already have an SKS. Thought about the 6.8 but didn't want to have another quantity of ammo, got to many now.

Had a 300 blackout upper with 8.5" barrel. No issues. Ran fine. About as accurate as expected from a short barrel.