18"
Also, if it is cut, and it is not 18" in length from the breech face to the muzzle, you have a SBS, a short barrelled shotgun, which is a controlled device and requires special paperwork.
"Just ahead of the forend" may well be 14-16", and that could be real trouble.
Cut a dowel 18" long, and drop it in the barrel with the bolt locked forward.
If you can see the dowel, protruding from the muzzle, you got a problem.
Lose the barrel PDQ and look for another.
But hey, maybe I'm just confused about the real length
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