Actually if you go by that wiki chart, they don't need to have brass deflectors, so one could be built with an full A1 style upper. As I said before, they are built on residual parts and don't have a definite criteria besides the 11.5 inch barrel and collapsible stock. The chart does say that a 733 isn't built on a flat top upper, which would make any of those a franken gun or a 933, so I was wrong there.
In my eyes, if it has the 11.5 inch barrel, the collapsible stock, and any of the parts that make up the ambiguous 733, it's a 733. Maybe not "factory" but lucky for whoever builds it, it's a random parts gun to begin with, so more or less, MPMs is pretty much an authentic 733.
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