No, a Nagant revolver uses expensive ammo.
The ammunition for a K31 may be more expensive. It's certainly a lot cheaper to buy a case of 7.62x54r or 8mm. However, The ammunition you are buying is match grade stuff, and it is non-corrosive. These rifles, with surplus ammunition, are capable of 1.5" or less groups. How many other surplus rifles can do that? An M39 is capable of such accuracy, but usually only with handloads. Most people are not going to get that kind of accuracy out of them with surplus.
Commercial ammunition for 7.62x54r is about the same price as commercial ammunition for 7.5 Swiss. There is a one dollar differance on AIM's site.
As for them being unique compared to a German Mauser? They are! Mausers are everywhere. Almost every nation adopted the Mauser bolt system. Even the United States in modified form. There are only three straight pull bolt actions I know of, and none of them are alike.
The only reason these rifles don't have a war record is because Hilter chose not to attack Switzerland. He had his forces stretched out and couldn't afford the new front. Although he did have plans to invade after the rest of Europe was under his control. The Swiss had all the border bridges and check-points rigged with explosives. Ready for demolition if they were ever invaded.
Just because a rifle was not on a battlefield. It doesn't negate it's historical value. There were plenty of Mauser's and Mosin's that never saw a battlefield. Most M44's were still in crates waiting to be shipped out when the war ended.
I honestly think your opinion would change if you had a K31.
Edit: Also, a K31 is your best bet in finding out the real history of any specific surplus rifle. If your K31 still has it's service tag. You can find the owner in Switzerland, (if he is still alive) and he can tell you exactly what that rifle and he himself went through.
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Who would have thought that my gun, which was assigned to me and which I wished would have jumped in a lake during my trainings on marches, would end up in America! That gun was assigned to me with bayonet in 1954 during basic training and I was in charge of it till my dismissal in 1977. I could have kept it, if I had enrolled me to carry on with unofficial shooting. I hope you have lots of fun with your hobby and I wish you a good eye and a calm hand.
Oh, and BTW, your not god. He wouldn't have had to edit his post.