That Magpul breakdown gun reminds me of the HK MP5K in a briefcase:
I saw an HK dealer shoot one in North Carolina at an IPSC competition back in 1998 or 99. It was a great idea, with the trigger in the handle. You could basically hold the handle with one hand and grab the bottom of the briefcase with the other, and spray rounds all over the damn place.
Speaking of that, the HK dealer drove his van, and backed it right up to the range - inside it looked like a gun lover's wet dream. HKs hung on pegboards all around the walls, like some sort of super-spy secret hideout.