If the OP’s gifted rifle was in new condition, and a pre 1964, I would never fire it. It is commendable that he is a man of his word.
As to the model 94s, obviously the pre 1964 versions are the most collectible. One of the best shooting 94s I ever had was a sintered steel version that had some wear on the receiver. I sold it to a friend because I just couldn’t get over the sintered steel receiver.
To me, the best deal out there are the AE models. I’ve shot some that shoot like a dream. They aren’t collectible like the pre 1964s, and the safeties turn off the purist collectors so the value stays down. I buy every NIB one I can find at a reasonable price. They have forged receivers, are well made, and the ones I buy are American made. I’m not referring to the high priced Japanese made 94s. Something about a foreign made 94 just doesn’t seem right.
My guess is that the steel in these AE models are better than the pre 1964 versions. I could be wrong, but metallurgy has come a long way.