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Not necessary to match brands, you will be fine mixing them. The systema silent piston head works fine with the laylax/prometheus cylinder just to give one example. The important thing is that they fit together.
As to the gear ratio. Using a M120 spring on ordinary gearing is common practice here in Denmark. Just make sure that you have done a proper shim job so the gears guns smooth and use a battery on proper cells (I'll say minimum GP2200 4/5 subC, but the ELITE4500 should be the bomb). The stock EG1000 should not have a problem turning the gears with a reasonable ROF. But you will most likely need to change the fuse to a 25 amp.
The piston is fine. And yes it is most likely a Deepfire. I have found these pistons to be very similar to the TM stock piston which is a very fine piston if you don't go above M120. Just trim away the second tooth, it will also give the gun a little buffer in the event of a jammed BB in the barrel and may prevent a false engagement between the sector gear and the piston.
As the gun have a v.2 gearbox, DO NOT use a metal piston head. It will cause the gearbox to crack prematurely especially in winter temperatures. From that same reason I would go with a systema silent head set. It will soften the blow on the gearbox cylinder window where the v.2 box usually fails.
As it is a used gun, a re-shim could be a good idea. I always open the gearbox and give it a service check when a new/used gun gets to me. Manufacturers does it to quickly and I don't know the mechanic skills of a previous owner.
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