Its where the gas tube takes gas from the barrel and sends it back to the bolt, so it can cycle the action. The little silver tube that runs along the top of the barrel, under your handguard.
You see flattop ar's without the triangle front sight, but they still have a gas block. Learn how to live with it, or get a new gas block without the front sight.
Just bought first time AR, what the hell are these two things?
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