You Tube finds

[Westmarcher]

Surprise at no 1!

Indeed!     
..... but also a tank I happen to like!   

[paulr]

I've watched quite a few of his videos, if only to hear him say proper German words in German.

Having seen his choices here (well no 5 and no 1) I'm not so sure about him.

He is Austrian so doesn't speak proper German

They sort of make sense given his "interesting" criteria

Some of his videos are good, others feel like he had to produce something so is quoting from a couple of books 

[fsn]

Gentlemen.

You know I have a weakness for a plummy accent. Combine that with naval aviation, and I'm hooked.   

[Lord Kermit of Birkenhead]

Cept that Costal wernt naval, its RAF ! You total Oik Nobby

[fsn]

I was using "naval" in the definition of "as or pertaining to ships of all kinds", as opposed to "belonging to, pertaining to, or connected with a navy".

[fsn]

Hmmmm.

[paulr]

 

[fsn]

In America you can buy 20mm anti-aircraft guns?

[d_Guy]

Interesting video. You need a come-along to cock it
To your question. At a minimum you would need a federal firearms dealer license - or - an uncle named something like , "Vinnie the cat".

[toxicpixie]

396lbs of force to cock it? Crikey, "action close" emergency use is a bit awkward! Unless you've got your trusty rope or block and tackle to hand

Wonder how much it went for... could use one in the garden, stop the pigeons and squirrels stealing all the veg...

[d_Guy]

... could use one in the garden, stop the pigeons and squirrels stealing all the veg...

...or those pesky drones!

[toxicpixie]

Might be overkill for drones...

Could help stop people flying large and noisy airliners or police helicopters over us, but I suspect the authorities might get soggy and hard to light if I did that

[d_Guy]

BIG drones. 

[fsn]

Lip reading WWI footage 

[fsn]

WWI in the air