[dice7]

pawn Код:

public OnGameModeInit()
{
    SetTimer("GunCheck", 1000, true); //set to 1 second and repeating
    return 0;
}


forward GunCheck();
public GunCheck()
{
    new max = GetMaxPlayers();
    for (new adminid = 0; adminid < max; adminid ++)
    {
        if (IsPlayerConnected(adminid))
        {
            if (IsPlayerAdmin(adminid))
            {
                for (new id = 0; id < max; id ++)
                {
                    if (IsPlayerConnected(id))
                    {
                        if (id != adminid)
                        {
                            new Float:x, Float:y, Float:z;
                            GetPlayerPos(adminid, x, y, z);
                            if (IsPlayerInRangeOfPoint(id, range, x, y, z)) //he's close to the admin
                            {
                                if (GetPlayerWeapon(playerid) == your weapon id's here)
                                {
                                    SetPlayerWantedLevel(playerid, 1);
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

The outer loop (first for() ) check the players if anyone is an admin. If a player is an admin, the inner loop gets executed, which checks if a player so close enough the to player. If he is, then it checks if he has the right weapon.
https://sampwiki.blast.hk/wiki/IsPlayerInRangeOfPoint




And no, it won't be laggy using OnPlayerUpdate to check if the players weapons, hence creating OnPlayerSwitchWeapon or something like that. OnPlayerUpdate was made exactly for stuff like that