Measuring barrel length

[larryw]

I'll be cutting down an extra 28" barrel so my duck gun can perform double-duty as an HD gun. After searching the ATF site and others, I can't find a definitive answer on how a shotgun's barrel length is measured.

Is barrel length measured from the end of the chamber, from the breech or somewhere else?

thanks,
Larry

 

[Hkmp5sd]

It is measured from the muzzle to face of the bolt, breech or breech block when closed and the shotgun is cocked. (179.11)

 

[larryw]

Thank you.