​
private ["_theAction"];

    _randChance = random 1;
    _equippedMagazines = magazines player;

    // As it is, script will fail if the random chance is say 0.6, nothing at all will happen no title text, no indication, I commented your values and added correct ones

    if ("Exile_Item_Hammer" in _equippedMagazines) then
    {
        //if (_randChance <= 0.5) then
        if (_randChance <= 0.7) then
        {
        player playMove "AinvPknlMstpSnonWnonDr_medic3";
        playSound "sound1";
        sleep 14;
        titleText ["You found nothing!", "PLAIN",1];

        };

        //if ((_randChance > 0.7) && (_randChance <= 0.9)) then
        if (_randChance > 0.7) then
        {
        player playMove "AinvPknlMstpSnonWnonDr_medic3";
        playSound "sound1";
        sleep 14;
        _targetA = player;
        _distA = random 2;
        _dirA = direction player - 180;
        _posA = getpos _targetA;
        _positionsA = [(_posA select 0) + (sin _dirA) * _distA, (_posA select 1) + (cos _dirA) * _distA, 0];
        _weaponHolderA = createVehicle ["GroundWeaponHolder", getPosATL player, [], 0, "CAN_COLLIDE"]; _weaponHolderA addItemCargoGlobal  ["Exile_Item_MetalBoard", 1];
        player removeAction _search;
        uiSleep 10;
        theAction = false;

        };
    }
    else
    {
        titleText ["You need a Hammer to do that!", "PLAIN",1];
    };

​