The RL(=UL), RLS, Frontier, Compact and RSI all share the same thinner contour with a shorter shank. I greatly prefer this contour. I like taking the stainless RSI rifles and dropping them in a synthetic RL stock to make a version that would look like a stainless RLS. I wish that Ruger would make them. Even better if they did one in .358W.
I had a MKII RL in .243 that was an excellent rifle. I still regret selling it.
Now I am on the hunt for a stainless Hawkeye RL in .223
This is a .308 that was a Lipseys RSI before I swapped stocks and now is one of my favorite treestand/brush guns.