I was comparing the RB monogrip to the SB monogrip that I have, and if you examine the Hogue Monogrip, Jerry Miculek version, you can see the issue...
For the grips to have an identical profile, the SB version must have a relief hole made on the front strap of the grip. The grips itself are identical profile, however the front strap relief really doesn't seem to be popular among users. I'd imagine that the rubber and plastic substructure might not have the structural integrity to support the relief cut.
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