If they are still legal for you to purchase, I'd spend the treasure, move the house, family, business and get one.
“Sorry, annything over 50 Browning is under the NFA of 1934. That means the available weapons, such as the 20mm Lahti are highly controlled and registered with the goverment.”
In my country we need the same type of licence for a 22 rimfire as we would for one of these (seriously) and anything with a rifled barrel, unless classed as an antique (no licence required unless you choose to shoot it), or an airgun within a certain power limit,is registered with the government.
Is that the South African weapon? The one chambered for 20mm Mauser?
“Sorry, annything over 50 Browning is under the NFA of 1934”
That’s just a technicality. I’m thinking wildcat..necked down...we’ll call it the “5Aught-2Aught Varmit Killer”
I remember back in my teens years the catalog: Ye Old Hunter offered the original Lahti 20mm on skis for $99.95. Ammo was $2.50 a round which was expensive back them. My folks blocked the idea as I was already making enough noise.