I recently installed the 13 inch rifle length Viking Tactics version that I bought from CPWSA: Handguard link (Chris Patty is an outstanding person to buy from, BTW) It went over a JP low profile adjustable gas block and middy 16 inch barrel. The gas adjustment screw is accessible thru the slot in front of it.
Compared to my friends' JP handguards, I'd say it's a bit lighter. That's just by feel, however. I've haven't been able to take actual weight measurements yet. Diameter-wise, I'd say it's smaller.
I have no complaints so far, but I've only shot it off the bench to check POI. I still need to shoot it in a match. But it definitely feels great.
Gordo