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red devil. that all depends on if you get the z-r-hop kit or the regular kits. the regular kits give you 3 of the same size r-hops, not the diff sized ones.i can also do the mod for you, its the same thing i have done to a few of my own guns and to killerdragons guns and also armyra's masada.
I believe if you are doing it on a gas riffle, you need the "Z" r-hop. They are designed to work better when they get cold.