Going postal, in American English slang, means becoming extremely and uncontrollably angry, often to the point of violence, and usually in a workplace environment. We use to say that back in the day.

Is that terrorism? Of course it is. Everyone in the place was terrified.


Jon Davis, Marine Corps weapons instructor
The fastest, I mean fastest I have seen an AR-15 shoot is 25 rounds in 2.5 seconds. That was due to the use of a slide stock, which causes the weapon’s recoil to allow the shooter to depress and press the trigger without stopping, allowing a semi-automatic weapon to fire as if it were an automatic. The video explains why this is such a unique and extraordinary weapons accessory.

Is a semi-automatic an automatic? Hell no. That doesn't mean it can't shoot 25 rounds in 2.5 seconds or even if it's 5 seconds, what's the difference. .