I do seem to recall that overall crime stats, Finland doesn't exactly stand as a proud example of lawfulness. Violent crime and overall crime, per capita.
In terms of weaponization, I think that's quite erronous term when talking about Swiss and Finnish. Both countries have a conscript military, actually to be accurate the both have a tradition of a citizens' army. That's right, we both have military slave labor even today
Conscript armies in Europe as of now, maybe Cyprus, Turkey, Greece and Russia, and the two already mentioned ones.
The way that the US would fit into the citizen army concept would be the revolutionary militia maybe, or modern US national guard. Although to be fair some elements of USNG are pretty much federalized and deployed combat units like any other in US military, like some Air NG units for example. And USA maintains as of now a professional standing army at arms alongside national guard and pool of reserves forces.
Swiss and Finnish armies for the most part of their manpower rely completely on called up formations of reserve troops. Specialized services in the military are fulfilled by career soldiers even in peacetime though, in the peacetime there's a batch of new conscripts every year in military training. As well as professional border guard officials who would be amalgated into armed forces should the need arise.
In that sense Finnish and Swiss societies for the better or worse are actually much more militarized societies than maybe the US. I think the Swiss might even have a system for tax breaks for people who choose the regular military service as opposed to the peaceful alternative, though I'm not sure on that.
Finland fought a civil war in 1918. White guards and red guards were civilian militia organisations, white guard formed the hard core of the national army of the newly independant country. In WW2 era it became an all emcompassing national army in terms that former "suspected communists" or whatever were drafted all the same and fought for the country like any other. Post war attitudes have emphasized often the social cohesion that the national army provides.
As to the actual spread of different types of guns in Finland. It's true that the gun laws are quite strict, for the better or worse. But they are not strict like Australia or UK where in effect certain forms of sports shooting are banned because the acquisition of this type of gun is impossible. It's bureaucracy, permits, backgroundcheck and interview IIRC.
Probably a good portion are still ("military")handguns of various types, old military weapons from the militarized past that collectors just love, semiautomatic rifles are seemingly quite popular in a sport called practical shooting or something, haven't done it but it's seemingly done with semiautos to simulate military type of mobile shooting.
Some countries I guess can't just curl up and hide from the world, and bury their heads in sand like an Australian emu. Some countries seemingly have a track record of wars against Russia and some against Emus
The Russians are directly across the thousand kilometer landborder and everybody knows it. It's no joke that some people own even these dreaded tools of crime-causing offensive or assault weapons, mostly semiauto I'd think, AK-47s or AK74s. Or a high power accurate hunting rifle, with excellent optics, that's what US snipers used in Vietnam when a military sniper rifle wasn't readily available all the time. Wasnt Remington 700 that modded hunting rifle that was quite popular?