I agree. I have a Radical Arms 7.62 x 39 upper and it works perfectly.
Reasonably accurate with cheap Russian ammo and if your use to shooting AR’s it’s the way to go. Just make sure you have good mags.
Had a custom built AK and a SKS. Fired them both once and sold them. The AK just didn’t feel right and I new it never would.
Mine came with a C-products magazine.
I need more, what magazine do you find works best?