18" Barrel Requirement

[00BuckShot]

I have an extra barrel for my 870 and I'd like to cut the one without the vented rib down to make an HD shotgun. I don't want to make any mistakes on this one and put myself in a bad position. At what point is a barrel measured to 18"? Is it from where the receiver meets the barrel? Thanks for the help.

[Technical Ted]

From the bolt face to the end of the barrel--or anything permanently attached to the barrel and protruding beyond the end of the bore.

To be on the safe side, most manufacturers cut shotgun barrels to 18.5"

[00BuckShot]

TYVM! I think 18.5 will be done J2B on the safe side.