#define MAX_ROUNDS 2
#define RAND_AMMO rand(10,20)
#define TIME_BETWEEN_ROUNDS rand(100,500)
#define RELOAD_TIME 5000
#define SHOW_RELOAD_SYMBOL show reload_symbol;
#define HIDE_RELOAD_SYMBOL hide reload_symbol;

static-var ammo, rounds;
ammo = RAND_AMMO;
rounds = MAX_ROUNDS;

AimWeaponX()
{
   signal SIG_AIM_X;
   set-signal-mask SIG_AIM_X;
   if (!ammo OR !rounds) return FALSE;
   ...
}
FireWeaponX()
{
   if (ammo) --ammo;
   else
   {
      if (rounds) --rounds;
      else
      {
         SHOW_RELOAD_SYMBOL
         sleep RELOAD_TIME;
         HIDE_RELOAD_SYMBOL
         rounds = MAX_ROUNDS;
      }
      sleep TIME_BETWEEN_ROUNDS;
      ammo = RAND_AMMO;
   }
}