User blog comment:Callofduty4/Favorite SMG in MW2?/@comment-1367054-20100513054521

Haha, I concur with Bord, but I never use the P90. So:

No other attachments etc unlocked
 * Vector
 * Rapid Fire

No other attachments etc unlocked
 * UMP45
 * Rapid Fire

Hopefully that will change soon