Maybe the best ss gas block around - Faxon Firearms Ultra Low-Profile Gas Block

At first glance this looks like every other gas block around. It is not- it's way better for a number of reasons. First, the side cutout reduces not only weight but friction when you are installing it, esp if you have a tight fit to the barrel. Second, it has three set screws, which I really like. The other detail which probably gets overlooked is that if you look at the gas tube roll pin hole, you'll notice that the edges are beveled. If you've ever installed a stubborn gas tube pin you can really appreciate this seemingly minor detail. I've used all kinds, and while I am inclined to Geissele all the things, this Faxon block is my go-to.