This unknown 
The rifle appears to be inspired by the real M4A1, a fully automatic variant of the M4 Carbine. It was revealed in a short video clip of 
The Duke M4A1 appears similar to the 
It is possible that both weapons are the same base gun with heavy customization, though this is yet to be confirmed.
The Duke Arms Company logo can be seen above the magazine, engraved into the rifle itself.
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