How can I ship airsoft guns to the Philippines?

It will be less hassle in your part as a consumer to just purchase locally. Though there may not be a specific law that would prevent you from importing, they can still prevent you from owning. If you really insist on importing, you might want to visit Camp Crame PNP- FED and inquire, or secure permits prior to importation.

first of all ask the seller NOT TO MAIL TROUGH EMS...

if we are talking about parts then you can easily purchase them w/o any problem...

but if we are to buy the airsoft unit as a whole then you ll need an import permit for that

so much better buy your airsoft unit locally and import the upgrades you want when there non to be found in local shops