R Hop is more stable because there is less shift in the hop up material per shot, as it is actually attached to the barrel and not stretched over it. One of the main benefits of R Hop over any other hop up is that it does not shift back and forth along the bore of the barrel the way a standard hop mound would.
Rubber shifting, stretching, and variation aside, the main flaw of a drop in bridge nub or flat nub being used in a non R Hopped setting is that the nub is able to shift back and forth as it is just sitting in a cup and not actually attached to the arm.
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