CUSTOMS: Philippine customs authorities enforce strict regulations concerning temporary importation into or export from the Philippines of items such as currency and firearms. The transport of ammunition is illegal, and Philippine officials have arrested U.S. citizens for having even a small number of bullets or ammunition casings or shells in their luggage. Even items that look like bullets or weapons may cause delays. It is advisable to contact the Embassy of the Philippines in Washington, D.C., or one of the Philippine consulates in the United States (Chicago, Honolulu, Los Angeles, New York and San Francisco) for specific information regarding customs requirements, including importation of agricultural and
http://travel.state.gov/content/pass...l-warning.html
There is considerable political unrest in the Philippines at this time including armed anti government militias. Importing any kind of weapon is probably asking for more trouble than you want.