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To try and shed some more light on your questions:
A red piston sounds like a Laylax/PSS10 piston
A black piston sear sounds like a Laylax/PSS10 or a PDI. The way to tell the difference is to look at the small pin that sticks out of the sear. If it's chrome coloured then it's a PDI. If not you have a PSS10.
If you have two holes in the piston head then you don't have a stock one. If it's a chrome colour then I believe it should be a Laylax/PSS10 as well.
Bean's recommendations are bang on although if you want to tinker some more with the gun you could just buy a trigger sear, spring guide stopper and spring guide instead of the zero trigger since you seem to have an upgraded piston and piston sear already. It will probably end up being cheaper although you will probably run into more problems getting it all to work.
There are a couple of guide for getting the piston head out from the cylinder. The method I've always used was to take a 2.5mm Allen key. Place the short end in one of the holes in the cylinder head and unscrew the cylinder head out by pushing the key against the nozzle. You can destroy your cylinder head using this method but I haven't done any serious damage to my parts using this method. The other method I've seen people use is to wrap the nozzle in electrical tape and then use pliers to turn the piston head to extract.
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