An adjustable gas block’s a device installed on the barrel of AR-15, AR-10, or similar rifles that allows the user to fine tune the amount of gas directed to the bolt carrier group. This helps optimize cycling, reduce recoil, and improve reliability, especially when using suppressors or different ammunition types. It works with AR-15/AR-10 barrels (with a gas port), compatible gas tubes, upper receivers, hand guards, and bolt carrier groups, making it ideal for custom builds and precision shooting setups.