Dueck Defense / AR10 issue, help!

[RayGun19]

So, I find that I'm in need of a new gas block for my AR10.  I bought a set of Dueck Defense RTS and installed them on my AR10.  With my ACOG it's a tack driver, but I couldn't get the sights to print at all.  I did the old "look down the bore at a target and then check the sights" trick.  The sights were WAY off.  I couldn't believe this.  A check of their site looked like they couldn't be used on an 7.62 platform.  But The article I read showed Barry using them on one.

An email to DD was responded to by Barry himself!  He let me in on that Armalite has a lower bore height gas block rail than standard, and that compounded the problem with the sights being on a 45 degree angle.

Sooooo, I need a new gas block.  It's not really being used as a gas block anymore, just a mount for sights and the delta ring.  So I'm looking for a light weight, well made gas block in .750 through bore.  Rail mount on top, and maybe on the bottom, but it has to be clamp style.  Any suggestions?

[Robocop1051]

PRI, JD Machine and MI all have a gas block the same height as the upper rail. Just make sure you get the .308 specific one. I have the PRI in 5.56 and 7.62, there's a sizable difference between the two.