In Zombie Panic Source, what effect do guns have on running speed?

Here in the forum,

"Every weapon/item/ammo picked up lowers a survivor's movement speed (shown as velocity in the cl_showpos 1 command) by a certain amount. The amount is simple addition or subtraction, if a survivor with nothing, speed 195, picks up a sledgehammer, it would lower his speed by 14.5, making his new speed 180.5. Guns have two numbers, the left-side number is the empty weight of the gun, the right-side number is the weight of the gun fully loaded."

There is a link here, where all of the weapons, ammo, and equipment (and the amount of weight they add) are neatly listed. ^_^