The barrel length of a Category H weapon (handgun) is established by measuring the distance from the muzzle to:
- For a revolver - the breech end immediately in front of the cylinder
- For any other Category H weapon:
- if the weapon has a breech bolt, the breech face with the breech bolt in the closed position
- if the weapon has a top slide, the breech face with the top slide forward; or
- if the weapon does not have a breech bolt or top slide the breech face with the break action closed.