It feels to me more like it takes a N frame to match up with the GP100 than the L frame. This isn't a bust on the L frame, it's just that the Rugers are all so over built. That would be like comparing the N frame to the Redhawk. It just isn't the match up that some think. That would be about like comparing the 27/28/627 series to the .357 Redhawk... Yikes... Reeeeeaaaaaalllllyyyyyy different.
And for a Security Six to GP100 side by side: