Swapping uppers in an environment like WA would be close to impossible. Your barrels would be impossible to keep clean, and the chamber would be full of so much stuff that you'd have constant jams. I'm not one of those "M16 variants are horrible and always jam" nut jobs either. My M4 saved my life plenty of times and I trust the AR platform since I know how to use it. But short of sealing the upper in a plastic bag to carry it around, you're just asking for a dirty chamber. I like the idea, though. It makes a very versatile fighter and eliminates an entire weapon system.

I know for a fact that our UH-60 pilots had MP5s. Granted, the JGG isn't a Blackhawk, and our pilots are US Army aviators, but it's not out of the realm of possibility that the original rescue pilots for the JGG weren't Army pilots that didn't already have a bird. I'm grasping at straws with that theory, but it's not THAT crazy.

Thanks crowbar. That is in my top 5 scariest things that has ever happened to me.