No, you only SEE that he has a crowbar. Who knows what is under his jacket or tucked in his waistband.
Mute point in Colorado, once he steps through that door deadly force is authorized no matter what he's armed with.
I would take a shotgun but I also know how to operate an AR15, AK47, or any other big bad scary "assault" weapons. In 22 years in the corps, I fired on full auto about once that I remember. That was before the M16A2 was introduced, after that the most that you could do was 3 round burst.
It doesn't matter what the cyclic rate of your weapon is, anyone that shoots that fast is not going to hit much, you're right. But, that's on full auto. You need an FFL to buy one of those legally, so your argument is null and void. Only a few elites of society own them, not us peons.