I always wondered that. I have a boo-yaah and it works great. Though I put it on my reto mag and had some issues, I will try it on the retro w/ the boo-yaah on/off valve and see what happens. Though everyone seems to like the hypder frame, what does that have that the booyaah doesn't or can't. Also can a hyper work with a retro valve well? Anyway I like the reactive trigger on the retro, even if the booyaah can work on it, i still might stick with a mechanical gun, due to the lightness.
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