FTKs can be costly, personally the only thing I would most likly switch out would be the Bushings, piston, piston head, and airseal nozzle. The spring gives it a high enough FPS as is, if you want higher you can get one that could boost that, if you were to go anything higher than what comes in the gun which is supposedly an m120 equivilant I would recommend a bearing spring guide as well. If you choose to lower the spring to something closer to a stock TM or a systema 1 joule, I would consider changing the battery from the 9.6 that comes with the gun to something in the 8.4v 1100-1400 Mah area. Just to reduce the wear.
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