Once upon a time there was a funky little combo gun the M-6. It was not a combat weapon. It was designed to forage. I don't know of anyone who actually used it for that purpose.
When I was flying (as a passenger until I was needed outside of the helo) I started with an M-16 and changed to an M-14 (hey, I didn't have to hump it through the boonies). I met a few pilots and other flight status types. None hand much more than a handgun, usually a .38 spl revolver. It amazes me that it took this long for someone to finally come up with a rifle a downed aircrewman could actually use for more that rabbits and birds.
I see only one issue. The pilots back then never, and I mean never, practiced with their handguns. I really doubt they will actually be able to assemble this one much less hit anything with it. After all, they aren't ever going to end up behind enemy lines. That only happens to the other guy.