I've heard mixed reviews
mostly good though
I've used two modify flat rubbers to convert barrels to R-hop. The flat nub is GREAT for use with R-hop, but the rubber I found was on the hard side. One was okay, the other I had to sand the mouth a bit because it was too difficult to push a BB past.
Honestly I would stick with a PDI-W or firefly though, they have more consistently awesome performance reviews
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