I have a 13" and 15" alpha. They are pretty aggressive on bare hands, but were the best looking thing on the market when I bought them. There are enough holes and space between the barrel and rail that they don't get hot unless you dump *many* mags quickly.
Since then, the smoother and slimmer M-lock or Keymod rails have come out from other manufacturers (BCM and Midwest Industries) and I think I like them more than the Alpha. I think Troy has a pretty decent looking M-lock rail as well, but when I was last shopping nobody had any on hand.
The Alpha is a well made rail and the fact that you don't need a special barrel nut is a bonus.
Edited by JohnGaltOU812, Mar. 14 2018 - 01:06 AM.