I agree with KM RH series new type being very good, but when you get to the RH65 and especially the RH75, you quickly realize why they say these are meant to be only used with KM inner barrels. The fact that you're locked to just one brand of barrel makes them lose a point in my eyes, and as a result, I have to favor Firefly over the KM brand. The Firefly hop up rubbers also feature the V-notch, which is to increase accuracy in hop up flight - not for speed.
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