[GTLS]

OMG please put your code between, [code] tags next time.

Код:

for(new i=0;i<9;i++)
{
     if(PlayerInfo[playerid][pAmmo][i] == 0)
              PlayerInfo[playerid][pGun][i] = 0;

     SetPlayerWeaponEx(playerid);
}

Isnt it more readable? ^^
Put it under OnPlayerUpdate or under a function using which you can remove the weapon.