I love mine. Lightweight and is rock solid. Everything mated up flush with my upper with very minimal gap between the handguard and the upper.
Sorry for the crappy iPotato pic -
The hardest part is getting the barrel nut timed exactly right for the rail to line up perfectly square. My advice is to hit your 35lb minimum 3 times and then just tighten in increments until your rail lines up.
Once the barrel nut is timed, you slide on the rail and then tighten down a locking nut with a pair of ~ 3/8" solid steel pins.
Easiest way to install is if you have a BEV block or a reaction rod to hold everything while you're cranking down the locking nut.
You've got to really put some effort into the installation pins Fortis provides to get everything nice and tight. Don't worry, the pins can take it.
One tip - Insert the pins into the locking nut until they're just fully engaged, then put some tape around the pin as a stop to keep from over/under inserting into the hole.
This will also help prevent any marring of your rail as you're tightening the rail nut.