[tappedandtagged]

Does anyone know where I can get a tube extension for a Mossberg 590a1?

Does anyone know how to put a bayonet on a Mossberg 590a1 and/or Mossbery 500?

Thanks!

You can't simply just get one for the Mossberg. The way the barrel screws into the end of the magazine tube, you'd have to buy a new magazine tube and a new barrel. As for a bayonet.... I dunno, why would you need one? Oh, and welcome to the forum.