I'm a big fan of Midwest's rails-I've used a number of both their free float and drop in on an number of builds.

I also really like Aero Precisions' stuff. I was just gifted an complete Aero upper that has an mlok free float rail on it. It's a belated birthday present from my older son who was deployed when my 65th rolled around. He also is giving me a lower with his "Dustoff" combat patch on it. His unit did a group by on both.

I truly don't feel you'd be disappointed in the Midwest. Good luck and have fun.