This guide, drawing on expertise from Faxon Firearms and InRangeTV, details the technical aspects of AR-15 barrel profiles, length, and treatments. It explains how profile affects rigidity and heat management, discusses historical context from the M16 to modern AR-15s, and advises on choosing the right profile for civilian use versus military applications. The guide also covers the benefits and trade-offs of fluting and nitriding, emphasizing quality control.
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