User blog comment:Erickbotas/Have you ever wonder....../@comment-1079585-20100121013228

It's because IW made the stupid decision to allow optics on machine pistols and not handguns. Because I "don't believe" in Akimbo, I think they should have added the Tactical Knife to all pistols without it taking up an attachment slot as a way of making them a bit less underpowered.