Bandit,
Sounds like you have a Watson's Weapons 50 BMG upper, that's the only one that I know of with that design. They bought the rights to build them years ago from a guy that tinkerd with firearms designing.
Look them up and if It's what you have, give them a call and get yourself some more info about your upper from them.
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I see the world thru bloodshot eyes
Streets filled with blood from distant lies
The dogs of war never compromise,
No time for rearranging.
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