I have the PDW in the picture and while the rail in question is loosely similar, a lot of the PDW's uniqueness comes from the fact that the rail is part of the upper, whereas the pictured rail is clearly two pieces.
If it's claimed to be a 416 rail, I'm guessing it's also much bigger. I've also noticed on 416 rails and uppers that I've seen that the rail is raised quite a big height off the receiver compared to an m4, whereas the PDW is much closer to an M4 height.
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