50 cal upper questions

Disregard my name... I know nothing about 50s, it was an impulse years ago lol.

I'm looking for some info on 50 cal uppers... There seems to be some confusion depending who I ask about the legality. Are all 50 uppers banned (that are not dtc)? I want to build a single shot stubborn mule lower and just want to make sure when I purchase an upper, I don't cause myself any grief down the road...

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50 cal upper questions