Downsizing to pay for a PC, if you have parts to trade lmk! Marui p90 has Guarder hop up bucking, as well as a more powerful motor, either System a or a TM eg(1000?) In it. I'm pretty sure I replaced the geartrain with the other the hardened systema ones or the ROF helicals. I did use the bearings though. Put a Guarder 1.5x spring (350fps one), bearing spring guide on one or both sides I can't remember, and the Sorbo pad on it. Has a Prometheus tightbore 6.03 in it, and I put a metal upper receiver on it with a integrated red dot. Still have the original if you want that too. Has a polymer rail off one side for a flashlight or something but other than that the outside is pretty much stock. Has 4 mags, and a sling. Like I said 450 or best offer, open to trade for computer parts as well lmk what you have.