[jdun]

I don't know how a kid would mess up the gas tube and gas key. It's not like they can take it apart without tools.

Come on if the AR15 was so prone to breaking we would see more dead kids coming back home from over 8 years in Iraq. Your chance of getting killed in a major city like DC is higher then your chance in Iraq (at the height).

Again fouling doesn't magically disappear. It just get relocated. Fouling for AR15 DI is in the bolt because that's where the cylinder is located and that's where the gas goes in. Fouling for rifle piston and not just AK but all piston rifles is located in the piston and piston tube. That's where the gas enter and stop.