Now that's funny. Best explanation I've heard so far.
Imagine a room full of Mossberg marketing and design people:
"OK so we've got this new silencer looking thing we can bolt on to the barrel to attract all the mall ninjas."
"They'll sell by the truckload"
"OK so what do we call this silencer looking thing on the end"
"We can't call it a silencer, mall ninjas don't want to pay the transfer tax"
"We can't call it a fake silencer, because the fake qualifier takes the tacticool rating of the gun down by 54 points in our market research study"
"So what are we gonna call this B---S---??"
"BS, Barrel Stub? No, Bolt on Scrap? No, too honest, Barrel Stabilizer??, Ding ding we have a winner......."