I finally got my 12.37" Evo rail in and got to run it. I like it a lot. Fairly small diameter, but not as small as the Troy. I don't mind this though.
Groups tightened slightly, but no PING from the rail when fired.
Ran the front sight backward to better position the light mount. Feels great using the KAV VFG as a hand stop with my thumb over the light mount. It's lighter than the Mid-length YHM.