This guide details a practical test to demonstrate how the AR-15's gas block and tube assembly can affect barrel harmonics and accuracy. The VSO Gun Channel host, an expert firearms instructor, walks through firing groups with the gas system intact, removed, and reinstalled, using subsonic .300 Blackout ammunition to amplify potential accuracy differences. The results highlight that even components designed to be free-floated may not achieve true free-float status due to the gas system's interaction with the barrel.
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