No, I mean it's literally the exact same principle being used. The only three differences are 1. the material used, 2. slightly longer contact, and 3. the hop arm arm doesn't have to go down as far.
But the slightly longer contact won't matter unless you're up in the 2.5j+ range using super heavy BBs like .43+
So either it's the wrong rubber, or the install wasn't done properly.
All the properly flathopped guns I've seen and built shoot just as far as Rhops. Cheaper to do, same performance, I think they just wear out faster.
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