Quoted:
Okay, my bad it's a Ohio Ordnance receiver.
This is the process they describe
Heat treated. Trigger, hammer holes and ejector are heat treated, then the whole receiver is drawn down at 575 Degrees for one hour. The receiver is now heat treated but not brittle. If you heat treat the whole receiver, the minute you quench it––it will warp.
Which is to say it's spot treated. And they claim that everyone elses receivers are warped. Goody. I may have to pass.
That means only the holes are really heat treated. Ejector too. The rest is basically mild steel. If you twist or bend it, it will stay bent!
That receiver is about the same as making one from a flat yourself.
NDS does full heat treating with no warpage. If you get it, I would rebuild it on a NDS or any other fully heat treated receiver.
You don't want to trip and land on your rifle and get up and find it bent. A full heat treated one will spring back.
Over the course of this year I bought four new NDS receivers to rebuild four buiilds I did on flats some years ago. Nothing wrong with my flat builds. I was proud of them. But there was no way I could fully heat treat them as a home builder. So I am slowly re-doing them on NDS's. Demilling the old ones was a real eye opener. Tearing those flats down was way too easy. You easily bend the material. Only the rails and holes had been toughened with heat treating. Just not the same as de-milling a tough original receiver stub or working with an NDS.
There is a builder on the AK Forum who offers fully heat treated receivers made from AKB flats. These are damn good flats. I used them myself. Funny.... He gets them fully heat treated with no warpage.
Personally, it would only be worth the value of the parts to me, since I would want to rebuild it on a better receiver.