Forum:Does anyone have specific data on how move speed is changed by weapons

I've been reading all the weapon articles in COD4, and very little is mentioned about specifics of movement speed when wielding various weapons. How is movement affected by heavier weapons? Does a LMG make you walk slower? Or does it reduce the amount of time you can sprint? Does it reduce the speed you can track (aim the crosshair) on an XBOX 360?

What guns let you move the fastest? SMGs? Sniper Rifles? And do different weapons in the same category give different speeds? is the MP5 faster then the P90? Outside of the P90/M21+Extreme Conditioning bug, what else is there? How does extreme conditioning affect the weapons? Do you move faster with a pistol out?

I am aware that move speed is determined by the primary weapon when using overkill. What happens if you pick up two pistols? Will you move even faster still?

i haven't been able to find any answers about mobility in general, save for perks.---