[MBilal]

Код:

put this under OnPlayerTakeDamage

public OnPlayerTakeDamage(playerid, issuerid, Float: amount, weaponid,bodypart)
{
if(GetPlayerTeam(issuerid) != GetPlayerTeam(playerid))
{
                if((weaponid == 23 || weaponid == 33 || weaponid == 34) && bodypart == 9) 
                {
                    SetPlayerHealth(playerid, 0.0);
                    GameTextForPlayer(issuerid, "~r~Headshot", 3000, 3);
                    GameTextForPlayer(playerid, "~r~Headshot", 3000, 3);
                }
}else {GameTextForPlayer(issuerid, "~r~Team killing not allowed", 3000, 3);}
return 1;
}

i added only 3 weapons you can add more ,small code and better