JP Enterprises V-Tac, same guys who make the awesome triggers for ARs. a lot of the snobs at
other websites tip their noses at these, i have noticed. i personally love mine.
some people don't like that you twist on the main nut and loctite it in place. you know, the one with the gas tube that goes through it?
i guess they think there is enough torque on the barrel nut while firing to break loctite and then sheer the gas tube... HA! mine is completely stable and you would be hard pressed to get it to move, even with a barrel nut wrench... ask me, i've seen me try it!!!!!!
i think it's the massive amount of felt side to side twist in an AR that makes them worry


Check out the description, I think you will like it:
"If you look at many of the hand guard systems on the market nowadays, most have permanent rails at the 6:00, 12:00, 3:00 and 9:00positions. Typically, you only need one or two sections of rail, and in many cases, they are best utilized at the 1:30 or 10:30 clock positions, not 9:00 and 3:00. Having to deal with the weight and uncomfortable feel of all these rails where you don't need or want them is not acceptable. These are just another example of products that are designed by people who are not real shooters for customers who just want their gear to look cool and don't actually use it. The V-Tac system allows for complete flexibility. You can use as many rail systems of whatever length makes sense when and where you need them and can forget about rails you don’t need.That's versatility!"
I got it because I wanted a lot of freedom in where I was placing things and I also wanted the ability to have a smooth grip up front without buying those freakin' inserts to fill the holes created by the rails that people buy to place things on, but then have to buy things to fill the holes so they can put a hand where they didn't place something.... sigh... you see how that gets tiresome??????
i have a carbine length gas tube, but opted for the mid length FF tube for greater versatility. did i mention i love it?
if you're near me, you are welcome to take a look at it
http://www.jprifles.com/1.4.4.php