Sa totoo lang dapat illegal yun.
From the rulebook:
16. Original parts and components offered by the OFM as standard equipment, or as an option, for a specific model handgun on the IPSC approved handgun list are permitted, subject to the following:
16.1 Modifications to them, other than minor detailing (the removal of burrs and/or adjustments unavoidably required in order to fit replacement OFM parts or components), are prohibited. Other prohibited modifications include those which facilitate faster reloading (e.g. flared, enlarged and/or add-on magwells, etc.), changing the original color and/or finish of a handgun, and/or adding stripes or other embellishments.