Unhhhh...no. That item does not actually exist as far as I know. Therefore the Spec Ops/Mil Sim crowd, who are normally pretty realism-oriented, wouldn't buy it. My guess would be the Hollywood/John Woo/Anime action flick crowd, who are too tied up with "Looks killer cool, dude!" to realize that it just adds another piece of junk to carry, inspead of combining the launcher and rifle the way they're supposed to be.
-Chris