unitname doFire objectname

unit fireAtTarget [objectname, "класс_оружия_которым_надо_стрелять"]

soldat fireAtTarget [tank, secondaryWeapon soldat]

UseWeapon

unitOne ["UseWeapon", <target vehicle>, <target unit>, <weapon index>]
Soldier 'unitOne' will play the action animation. Target unit will fire the specified unit's position in the target vehicle's (can be the unit itself) weapon mode index. The indexes seem to be based upon the order in which weapons are added to the unit/vehicle, with each weapon's muzzle's fire mode having an unique index. Weapons can be fired in this way from a not-readied position (eg, firing a rifle on a soldiers back). Pistols will fire from the current weapon's proxy. It can also be used to sound the horn on AI controlled vehicles.
Examples:
gameLogic action ["useWeapon",unit1,unit1,16]
gameLogic action ["useWeapon",vehicle unit1,unit1,0]
gameLogic action ["useWeapon",myTank,gunner myTank,1]
gameLogic action ["useWeapon",myTank,commander myTank,0]

SwitchMagazine

<unit> action ["SwitchMagazine", <target vehicle>, <target unit>, <mode index>]
Target unit switches to the given firing mode index. This allows selection of any firing mode for any weapon carried by a soldier, or mounted on a weapon. First are the firing modes for the primary weapon (index 0 upwards), then secondary weapon, then optics, then pistol, then thrown and placed weapons. Changing to NVGoggles just plays an animation, not actually setting NV mode. Unfortunately, the list of firing modes seems to only be created when a soldier is initiated; modes are removed from the list when a weapon is dropped and not re-added when a weapon is picked up. Thus, only use this during the initiation phase of the soldier. On vehicles, where the weapons are not likely to be changed, this action might be useful after the vehicle has been initiated.
If the mode index is higher than available indices, it assumes index 0.
If you just want to change the muzzle used, rather than the firing mode, the standard command selectWeapon is generally more useful.
Example:
gameLogic action ["SwitchMagazine", unit1, unit1, 3];
gameLogic action ["SwitchMagazine", m1a1, gunner m1a1, 1];

SwitchWeapon

unitOne action ["SwitchWeapon", <target unit>, <target unit>, <muzzle index>]
UnitOne plays the action animation. Target unit switches to the given muzzle/mode index. Target unit can also be a vehicle. The weapons array is a list of all weapon modes specific to each weapon, muzzle and firing mode combination.
Example:
unit2 action ["SwitchWeapon",unit1,unit1,7]
player action ["SwitchWeapon", vehicle player, vehicle player, 3]