Man that brings back memories. When I was 4 or 5 I had one of these, a Marx Ma Deuce. (Mine was all OD green, not camouflage like in the video below.) I don't know what happened to it, but I sure went through a few blister packs of D cell "ammo" on Christmas morning!
Wow...here’s a commercial on the entire “Gung Ho Commando” set. I remember the complete set—I wanted one badly as a kid, but didn’t get one. I’d forgotten it was a .50, not a .30.
http://www.youtube.com/watch?v=14kc_uiM7jY
Note how the portray the fat kid “chowing down” on the chow...LOL!