Over here the barrel is over-bored for most of its' length, just leaving one small section of rifling near the muzzle. Internally, areas of metal from reciprocating parts of the weapon are also ground away, thus weakening the structure.
Where I live, it's easier to go down the pub and buy a live one from drug dealers....
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"Stand by to pull me out of the seat if I get hit" - Guy Gibson
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