[MadMax]

There seems to be a strong sense of respect for designs in Japan. WA has had crummy hopups for ages, but they never copied TM or KSC designs. It's interesting to note that every Japanese gun maker has their own unique hop up designs while the Taiwanese copyshops well, copy. TM has had patent protection on their hop up design for some years which has forced some differentiation. It may be possible that their Hicapa hop is still under patent protection which precludes aftermarket makers from getting into the game.