If you've ever fired a rifle that felt harsher than it should, threw brass into the next zip code, or blasted gas back into your face behind a suppressor, you've likely met an overgassed rifle. The fix is often surprisingly simple and surprisingly small: an adjustable gas block. In this guide, we'll cover what an adjustable gas block is, how it works, the real-world benefits, who needs one, and how to tune it correctly. What Is a Gas Block? In a gas-operated semi-automatic rifle like the AR-15, …