Today I picked up a brand new Mossberg 590A1 shotgun with my tax return. This one has the 20" barrel, ghost ring sights, and bayonet lug. My one question is will any M7/M9 bayonet fit on this thing? I been looking at them online and it seems like the ones made by Ontario Knives is the one to go with. I know there's no real practical purpose in having a bayonet on a shotgun as a civilian, I just think it'd be fun to stab a watermelon and pull the trigger, plus it looks much more menacing with the bayonet!