I wonder what sort of license or credentials one needs to buy this rifle?

[Black]

https://www.minds.com/blog/view/538487741193658368

[OWC Jamie]

won't fit in a cracker jacks box

[Racer X]

It doesn't use an explosive propellant or have a projectile, so BATFE isn't involved.

[RAMd®d]

It's probably over 100mw, so the FCC might be involved.

[Bernie]

If you are closer than they are, the same power will be stronger, closer.
I prefer a paint ball gun. Oops!

[freeradical]

The same kind of license that's needed to use a cell phone jammer?

[cbelt3]

No license, but be prepared for letters and fines if you are caught.

That said, a 'burst' transmission like a capacitor driven RF gun generates is not really within the FCC's enforcement skillset. HOWEVER.... if you fire this sucker around a USAF facility ?

[spoiler=Personal Aside]
Back in the early 80's I was working on a system that was used to train US aviators how to avoid a Soviet anti-aircraft gun (The infamous ZSU-23). It was designed to be mounted on an armored personnel carrier, and duplicated the transmission profile of the radar on the ZSU-23.

One day we young engineers were farting around with the system and had the bright idea to point it, with the radar operating, at a Air Guard F-4 on its landing approach to the St. Louis airport. Hey.. perfect test, right ?

Well, the pilot, per checklist, had his threat detection systems working. And reacted with textbook speed and precision. He dumped two flares, rolled the plane over and went down to the deck (over a heavily populated area), and scooted into a landing. And while we were standing around drinking coffee and congratulating ourselves for having a 'cool system' a USAF sedan screamed up to our little test area, and an ENRAGED Lt. Colonel in a flight suit jumped out and started screaming curses at us.

Hoo boy we were in trouble for a MONTH !
[/spoiler]

[Racer X]

Did you hear the thunderclap as his sphincter slammed shut?

[Paul F.]

More importantly; did they guy tasked with cleaning up the F-4's seat track you down?

[cbelt3]

Racer X wrote:
Did you hear the thunderclap as his sphincter slammed shut?

Heh... I worked with a guy who flew Navy F-4's in Vietnam. He referred to "Sphincter Factor" a lot.

He kept some of the mission audio tapes... he described one..

AC Marshaling Status chatter
AC Launch chatter
Aloft strike assembly chatter
"Feet dry"
Then radio silence for many minutes.
Then "SAM ! SAM ! SAM !" from one guy. and then..

"WHERE ! WHERE !" from EVERY other pilot.