All the Chinese-made Leapers/UTG stuff I have ever tried is good and solid (but usually overbuilt/overweight). In sights and risers I generally consider this a good thing. They also have an all American-made "Pro" line that you might want to check out.
Mike
PS. I am using the Troy rail recommended in the S&W application manual when the M&P10 first came out. It is a bit thick and the accessory nuts don't leave much clearance as they sit above the inside slots rather than in them like the Sampson Evolution rail. I tried the Evolution first but it does not fit the S&W barrel nut tightly. I did not try swapping a DPMS barrel nut. The Sampson system (either from Sampson or the special Rainier Arms branded line) continue to be a favorite of mine for AR15 due to slimness, light weight, clearance, and the ceramic heat shield between the barrel nut and the rail.
Given the recent political concerns with Troy, I'd look elsewhere if I were to do it again. Possibly try a DPMS nut with the Evolution or go with something KeyMod.