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Methods for measuring the barrel length of a category H weapon (handgun) are as follows:
- For a revolver – from the muzzle to the breech end immediately in front of the cylinder
For any other category H weapon:
- if the weapon has a breech bolt, from the muzzle to the breech face with the breech bolt in the closed position
- if the weapon has a top slide, from the muzzle to the breech face with the top slide forward; or
- if the weapon does not have a breech bolt or top slide, from the muzzle to the breech face with the break action closed.