[Future Snake Eater]

Sorry, I need to contribute! :0)

I give you the M41A pulse rifle, 10mm, caseless ammunition with a mounted pump-action grenade launcher.

Also knonw as a Thomspon with an unknown (to me, anyway) type of shotgun under the barrel, some plastic doo-dads and a digital "remaining ammo" counter added on for good measure.

[Weya]

I’m gonna say “Aliens” (with Sigourney Weaver...YUMM!).

Though I think the undermount is a grenade launcher.