I think I remember him from the CMPicon forum. I think he is a genuine newbie, I don't think he is one of the bad guys in disguise.

Copy and paste of my response to his thread on another forum:

The best way to get a genuine flip sight is to buy one attached to an original World War II configuration carbine.

Even if you are able to find genuine USGI early parts, the final result of the restoration won't be the same or worth the same as a legit original carbine.

What's the point of spending a lot of money on parts claimed to real but are probably fake? Statistically, because of the rarity of the genuine parts and the ever-increasing number of fakes being churned out, the odds are any flip sight, Type 1 band, pushbutton safety, etc. you see for sale is fake.

A carbine restored with reproduction parts is not original. Neither is one restored with genuine USGI parts. Both are restorations, not original. Originality, like virginity, can't be restored.

Therefore, if you just have to have a World War II configuration carbine, but don't want to pay what that costs, use reproduction parts honestly sold as reproductions at reproduction part prices. That way you will get what you want (a carbine that looks like it did during World War II) without being ripped off.