The gas block is under the handguard of an AR-15. It's over a hole on the top of the barrel. When you shoot, some gas goes into this block and then back to the chamber. Some AR-15s have too much gas going back, which can make the gun dirty.
How to Pick the Right Gas Block Size for Your AR-15
Referenced Strike Industries
To get a new gas block, you need to know its size. Online, you'll see a size like 0.750". This size should match your barrel's width.
Most AR-15s have a 0.750" barrel. If your barrel is thin like the old M16A1 design, you need a 0.625" gas block. Thick barrels need a 0.936" gas block.
If you're unsure about your barrel size, you can measure it. Use calipers from a store to measure the barrel near the old gas block. Then, you can buy the right gas block.
Other Things to Think About When Getting a Gas Block
Adjustable Gas Blocks: These let you change the gas amount when you use different bullets. This can make your gun parts last longer.
Low Profile Gas Blocks: If you have a special rail system for better aim, you might want this type of block.
Lightweight Gas Blocks: If you're in gun contests, think about the weight of your parts. Lighter blocks add less weight to the gun.
As the content creator of badassoptic.com, My background in the firearms industry and shooting sports gives me the experience to recommend tried and true products and keep away subpar ones.
