This makes me want to jump through all the NFA hoops and get a M2 Greasegun.
The incomparable Jerry Miculek:
Did you see that little hang-up at the end after two magazines? Starting to jam at that early? Now that is what makes me NOT want to jump through all the hoops and get a Greasegun...
Jerry IS faster with a revolver. I wonder... If he raced it if he could fire 18 revolver rounds before that machinegun did 30? Heck he might be able to reload four times and beat it to 30 with a revolver.