There would be a problem with having bling pro be 3 attachments. If you notice in MW2, none of the pro perks really upgraded the perk. they just added on a second string to the perk. For example, imagine Stopping Power pro being an additional x1.5 damage multiplier. It would pit an unfair advantage for the player without the pro. And if the 'all attachments' perk is added, not only will I be noobtubed by someone using bling and who has a RDS, i'll be noobtubed by someone with RDS, HBS, Silencer, FMJ, and whatever else im forgetting. IMBA.