Thats according to an interview by German based news outlet Spiegel Online with the Saudi Minister of Foreign Affairs Adel bin Ahmed Al-Jubeir recently.
Saudi Arabia would like to see surface to air missiles sent to moderate deemed opposition forces in Syria but do not want them to fall into the wrong hands.
SPIEGEL: Is Saudi Arabia in favor of supplying anti-aircraft missiles to the rebels?
Al-Jubeir: Yes. We believe that introducing surface-to-air missiles in Syria is going to change the balance of power on the ground. It will allow the moderate opposition to be able to neutralize the helicopters and aircraft that are dropping chemicals and have been carpet-bombing them, just like surface-to-air missiles in Afghanistan were able to change the balance of power there. This has to be studied very carefully, however, because you don’t want such weapons to fall into the wrong hands.
SPIEGEL: Into the hands of Islamic State.
Al-Jubeir: This is a decision that the international coalition will have to make. This is not Saudi Arabia’s decision.