This video explores the ideal AR-15 barrel length, emphasizing that it's purpose-dependent. A 20-inch barrel maximizes 5.56 NATO velocity and range, while 16-inch barrels offer a practical balance for civilian use. Shorter barrels like the 10.3-inch Mark 18 excel in close quarters, but very short barrels (e.g., 7-inch) in 5.56 NATO have limited ballistic effectiveness. The discussion also touches on alternative cartridges for short-barreled platforms.
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