Not on all mossbergs, but a barrel from any mossberg 500 will fit yours.
I have a 500A as well (the Lakefield-Mossberg, right?). Rifled barrels do come up here
on the EE once in awhile, keep your eyes open.
As a side note, mossberg barrels will fit onto Maverick shotguns. I do not know if the reverse is true.
