I had, and wore out, two of those when I was a kid. Got so good with it I could drill a grasshopper from the hip at ten feet just about every time. And that was just about all it would kill. Hit more than one sparrow sized bird, they just lost a little puff of feathers (maybe) and flew off, probably wondering what that funny feeling was. Great fun, but I would not rely on them for anything important...
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OBG