MFO/MOFO needed for lightgun use with PSone (SCPH-102 PAL)?

[bytestorm]

I am planning to make a DFO for my PSone (SCPH-102 PAL) and my aim is to play some USA lightgun games.. but they use the Composite port on the AV adapter (I will use RGB Scart). Will a DFO be enough or do I need a MFO/MOFO because I need to connect the lightgun to the composite port?

(Onechip will be used)