I think the issue over the K-31 as a military arm today is not it's mechanical capability as a battle rifle - rather how battles are fought and modern strategy. If winning means able shooters each locating and hitting enemy troopers, the K-31 is probably still an outstanding arm.
Not to divert the thread - but in the interests of historical accuracy, and the good people of Switzerland - this is a big pile of BravoSierra.
The Swiss took in more refugees per capita than any other nation, in addition to the Allied personnel given sanctuary. As well as essential trade with Germany for foodstuffs and fuels like coal, the Swiss provided some very high quality and specialized military items for the allies. The Swiss also had some of the best intelligence during the war and made it available to the Allies . The Swiss executed a considerable number of their own citizens who were Nazi collaboraters. While the Swiss did not, I believe, shoot down a single Allied plane that violated their airspace, they shot down a number of German military aircraft who did.
Lastly, not least; the Swiss had every right - moral and legal - to maintain their neutrality.