For accuracy, get a low-pro adjustable gas block that CLAMPS on...not one that has a set screw(s). There are a few out there. I believe the aforementioned Syrac is one of them.
Just curious- how does clamp vs set screw affect accuracy?
And from Mr. Whitley's website:You want a gas block that does not impose pointed stress on the barrel. Clamp-on types that grab all the way around the barrel are excellent. The blocks that are pinned on with tapered pins that wedge against the barrel or the slip on type of block with set screws that push up from underneath (or directly on the barrel) can deform the bore inside of the barrel and can wreck the accuracy of an otherwise great barrel.
Link to source: http://bulletin.accurateshooter.com/...ffers-answers/
Coincidentally, Mr. Whitley designed a 6mm wildcat based on the Grendel case.The best gas block for accuracy work is clearly the clamp-on type. It provides the least amount of stress on the barrel, while at the same time providing the best seal to contain all gas in the gas system. All our accuracy upper build ups are made with clamp-on gas blocks. In addition clamp-on gas blocks are also the easiest to install, adjust and remove so that the initial set up and any later servicing of the rifle or the gas system can be accomplished easily and quickly with no special tools.
Link to source: http://www.6mmar.com/Benchrest_AR.html
Last edited by Drifter; 04-29-2012 at 07:27 AM.
Interesting. Makes sense in theory but I don't know. Can little set screws really impart that much force to deflect a tube many times thicker than the diameter of the screws?