Works like a champ - Yankee Hill Machine Low Profile Gas Block With Pinch Screw Mounting YHM-9384

I personally like the clamp on style of gas block better. I feel it has a better lock up on the barrel, and particularly a better seal on the barrel (which is important in a gas operated system). There are other clamp on style gas blocks out there that are easily twice the price of Yankee Hill's, but this one is wholely adequate. I've used these on several builds and have never had an issue. My rifles perform very well utilizing this gas block. Another thing thats nice about using a clamp on versus a set screw style block, is if you have issues with the barrel (like a dimple that is offset) it wont affect your ability to properly index the block. Overall, this block is a win-win. A rock solid product and a great price.