I do seem to remember a couple of years ago when Finland tried to conquer the rest of the world, and therefore received a great deal of experience with their firearms in adverse conditions.
It doesn't really tell me much actually. First off, I'd want to make sure that they do, or ever did, actually issue them. Again, I'd prefer a link of some kind to an offical site stating that these countries issue these to their troops. Secondly, it's one thing to know they were issued. It's another thing to know how well they performed. I'd want to know how the troops judged the overall performance. And lastly, procurement of firearms can be motivated by all sorts of considerations. Performance and quality aren't always the only factor. Price might have been the only concern. Maybe the Glocks were the only things the Northmen could afford.
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The question was about Glocks and cold.Nordic countries that can afford to equip their militaries with whatever they would like choose to use the Glock.In the case of Norway,the Glock 17 replaced the P35 which in turn replaced the 1911.Sweden and Finland both have arms industries of their own;had they chosen to do so they could have designed and purchased an alternative but felt the Glock was more than good enough.
If you really need a picture,here are 2 Norwegian Glocks in Afghanistan: