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Actually the opposite is true.
The flat hop is more like a mound, the Rhop is a flat patch that's very close to being in its ideal hopup position.
The flat hop gets deformed from the barrel's outer diameter down into the inside diameter of the barrel.
For some reason the hop rubbers tend to be softer? Or maybe just lower abrasion resistance than the Rhop patches. But I find flat hops tend to wear out faster.
I've found in my own personal experience that the only time you really have any sort of "break in" period on a hop rubber is when it wasn't installed properly.
Like all my ptw hop mods, they all shoot pie plates at 260ft from the day they're installed until the day they wear out.
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