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Aero packages the M4E1 Threaded and the M4E1 Enhanced in the same exterior packaging box with a picture of the threaded upper (ask me how I know). The info would be on the white tag on the side of the box, which is not visible, even if blown up, from your pic. This -->
Since there are no handguard screws in place, if you are not sure, you could just slip the rail off. If there is a large, round add-on barrel nut, it is an M4E1 Threaded. If, instead you see this then it is the M4E1 Enhanced.
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