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K31 whenever you spot one as they are probably less made than well known rifles and they will hold their value. You don't need tp be concerned about corrosive ammo..
Next,Remington 03A3

My suggestion is to keep 6 "benjamins" tucked away in the deepest part of your wallet. Where to look? Smaller gun shows and pay attention to whoever wanders in with a single gun.
Do be willing to...