softer hopup rubbers seal better for the nozzle side... but aren't terribly great for lifting heavier rounds at higher fps.
harder rubbers don't seal as well but lift heavier rounds much better. This is why the Rhop is good.. the material is a reasonably hard tubing that lifts heavier rounds very well, but you combine it with the soft, best sealing shaved rubber of your choice for the best of both worlds.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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