This script makes a unit drop his gun, so Put this in a trigger or waypoint.
unitname action ["drop weapon",unitname,0,0,"m16"]
Remember that the unit can only drop the gun that he is holding. So if you want an east unit to drop the gun put
unitname action ["drop weapon",unitname,0,0,"ak74"]
And there you have it, a gun on the floor. (dont everyone thank me all at once)