Uh, I'm not so sure about that last one. The 6 shots, reload, and 6 more in under 3 seconds?

I mean, I know the History Channel is a plausible source and all, but can that be physically possible???
I have some doubts. I believe the 1st and the 2nd, but come on...
6 shots, reloading ALL SIX, AND THEN FIRING OFF 6 MORE IN 2.99 SECONDS???