Personally I hate that operator handguard and it looks to take a special wrench to remove. It's too big, too heavy and just plain ugly. I could not find the right place to "drive" the gun. See if they'd build you one with a Troy TRX Extreme rail and a low profile gas block.
Lot's of choices out there and if you're set on a vertical grip, look at Tango Down. I prefer the stubby grips but I use it mostly for a hand stop which is another option...
