I have an old HK-4 with all 4 barrel conversions (.22LR, .25acp, .32acp, and .380), it was my survival vest gun when I was flying in the Navy. I figured if I couldn't find ammo for it where ever in the world I was, I was more than likely on another planet or in the middle of the ocean. It's an easy gun to maintain and very forgiving I would recommend hi-velocity .22lr to insure it cycles properly all the time. And it's about the same size as a PPK.
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