I have the same hop up rubber, so yes, you got the right one as its advertised in ILLusion's retail thread as one for the marui GBB series. If there was something wrong with it, they wouldn't be marketing them. I'm sure they serve a purpose but I as well, am unsure of what they do exactly.
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The ultimate measure of a man is not where he stands
in moments of comfort and convenience, but where he
stands at times of challenge and controversy.
- Martin Luther King, Jr.
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