Oh sorry, i don't know that waiTT(3); exist...
I'm not a expert.
Test it so: Maybe it works.

Code:

---

var firing = 0;
var s_laser;

sound laser <laser1.wav>;

function event_fuoco() {
	firing = 0;
	ent_remove(my);
}

action fuoco {
	e_fuoco = my;
	e_fuoco.enable_block = ON;
	e_fuoco.event = event_fuoco;
	e_fuoco.scale_x = 0.066;
	e_fuoco.scale_y = 0.066;
	e_fuoco.scale_z = 0.066;
	f_fuoco();
}

function f_fuoco() {
	temp.x = 0;
	temp.y = 12*time;
	temp.z = 0;
	c_move(e_fuoco,temp,nullvector,IGNORE_YOU);
	s_laser = snd_play(laser,30,0);
	waitt(3); //
	firing = 0;
}

---