I previously tried a Sampson Evolution rail on my M&P 10 but was unhappy with the loose fit and went with the Troy.
Meanwhile, I have used Evolutions on Two other rifles and love the light weight and slender feel and dislike the sharpness of the Troy. Now that the 2014 version of the rail has KeyMod, I'm really excited. I may just use the Troy in the kitchen as a cheese grater.
The Evolution is designed for the AR15 with ceramic heat shield spacer and DPMS without. Has anyone tried a DPMS barrel nut with this rail?
Mike