An AR-15 gas block is a component that regulates the flow of gas from the barrel to cycle the action in AR-15 rifles. It fits over the barrel’s gas port and connects to the gas tube, directing gas back to the bolt carrier group for reliable cycling. The AR-15 gas block works with AR-15 barrels (with a gas port), gas tubes (carbine, mid, or rifle-length), upper receivers, handguards, and bolt carrier groups. It’s essential for proper rifle function and customization.
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