I'm extremely doubtful you can go to almost any First World world country and buy a gun. Heck, their own citizens can't buy a gun in places the the UK.
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Buying a gun is relatively easy in the UK.
Still a lot of hunting, target shooting (especially clays), pest control.
It's what guns you can buy that is the big problem.
Same with France. Buying a long gun is not that big a deal.