Correct, 18" barrel, 26" OAL, unless the OP wants it registered as a short-barrel shotgun. Easiest way for him to do that would be to file the Form 1 with himself as the manufacturer, ship it to an 07/C2 for engraving and the barrel work, and then have it shipped back to him.I think there is also a federal law about the OAL of the shotgun, including stock. 26" overall, I think?
I don't think that is what the OP is after.unless the OP wants it registered as a short-barrel shotgun.
inexpensive HD shotgun