there is nothing wrong with the OOW receivers, the way they are. I had a 74 built on it and fire a shit load of rounds through it, without any signs of the receiver falling apart, or otherwise failing.
I believe this whole heat treatment issue is a much ado about nothing, and a way for some builders or companies to profit on people's "fear" by offering heat treat services.
someone on this board built a post or sample, select fire AKM on that receiver as is, and stated there is nothing wrong with that receiver the way it came from OOW......and I have yet to read one post, that their OOW receiver failed due directly to it not being fully heat treated.....NOT ONE.
so really your concerned about OOW is unfounded, and you're just believing a gun board rumor, that is being spread, with no basis in fact.
until someone can come on and prove without a shadow of doubt that their OOW failed, it's all just speculation, and "fear" generated rumors that are just being spread.