Quick Tip: AR-15 Gas Block Diameter Explained
This video provides a technical explanation of AR-15 gas block diameter. It clarifies that the gas block fits over the barrel and directs combustion gases to cycle the action. The video highlights the importance of matching the gas block diameter to the barrel's outer diameter, listing common AR-15 barrel diameters such as .625" for "pencil" barrels, .750" (most common), .875" for some bull barrels, and .936" for target bull barrels. It emphasizes ensuring the correct gas block diameter is chosen for a specific AR-15 barrel to ensure proper function.








