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Expert Answer
The LINK does have some hard edges and is not radiused, but that is to aid in grip as something like this will allow for grip even under adverse conditions. So, if you are squeezing and running it for a long time, it may become uncomfortable, but the design has its reasons for the ridges and edges.
Took a Dremel to smooth out the edge radius on the ridges, and blend the lip on the front end into the handguard. Huge difference and way more comfortable on bare skin.