dont forget the old austro-hungarian pocket pistols had a very long barrel but the front sight was located in the middle of it so you could take a hacksaw at home and made a real pocket pistol of this in two minutes.
gunlaws to forbid special things are a challenge for human ingenuity and allmost ever the brain find a way.
if we look for the Mas 36 hunting rifle it was offered in 8x60S a cartridge invented by the german gun industry in the 1920s after the allied restrict the amount of military rifles in 8x57. so every privat person was forced to rechamber his mauser to the new 8x60.
this cartridge was a succes called sometimes 8x60 Magnum or 8x60 Bombe showing it was a potent round. anyway in the 1930s the ban falling in germany and people go back to the beloved 8x57.
but Belgium and France who were behind this ban get a new gun law that ban all military cartridges for civil use.
France just before WW 2 maybe in the moment when the leftist loser of the spanish civil war crossing the french boarder with a mishmash of militarys rifles. when the war ended the law was still in use there now to get the many military guns out of the population.
8x57 was still a great cartridge like the mauser 98 was a fine rifle so now the french and belgian were forced to rechamber the rilfes for the 8x60. this happen until some years now - maybe 4-5- when the law in france was changed. don't know the situation in belgium today.
now the french law only ban actuall military cartridges like 308, 223 rem or 7,62x39.

a history of gunlaws against special guns, cartridges or gun parts and how this story ended than would be good read.

8x60S is a rare caliber in the Mas 36 and many of this rifles were actually sold in the french occupation zone in germany including my own rifle that was sold by a gundealer in Freiburg near the french boarder.
crop protection was important than like it is now, maybe more because the times were much harder. so the french who confiscate any hunting rifle they got in the hands were forced in the end to sold the new rifles to the krauts.
never see a 7mm Mas rifle with such a german dealer stamp so it seems they were hardcore 8 mm lovers.