Call of duty black ops question?

when i pick up a gun from a dead player, i see that they seem t have warlord and slieght of hand. how o you do that? an example is that i see gun with a silencer and a red dot sight and slieght of hand. so tht men they and slight of hand and warlord. another example is dual mags and red dot. i reload twice to make sure it is slight of hand. how do you have sleight of hand and warlord? plz help