How do I check if a unit has fired a shot?

[TerranAce007]

I'm trying to sound an alarm when a shot is fired, but I'm not sure how to do that. I tried this, but I get an "error unkown operator ammo" message.

-Trigger-
Condition: BulletCount = sniper ammo "SG550mag"; BulletCount < 30;

or

Condition: sniper ammo "SG550mag" < 30;

Activation: Sound Alaram...

The syntax is correct according to the Official Command Ref. manual for OFP 1.85, but I'm using 1.90. Maybe it has been removed?

How else could I sound the alarm when the player shoots? It goes off if he kills someone, but if not, the crowd just looks around, then continues to stand there calmly. I want them to run away!

[Black_Feather]

sniper ammo "SG550mag" < 30

that should work but make sure you have the magazine name right, if you don't have any luck try this

sniper addEventHandler ["fired",{playSound "alarm"}]