note Specifically, Armalite's president George Sullivan insisted on the use of a composite steel/aluminum barrel of his own design, over the vehement objections of Stoner and despite the fact that this composite barrel had yet to even be tested. During trials, prototypes proved favorable, until an unfortunate design flaw caused its barrel to explode. The AR-10 was offered as a replacement for the M1 Garand when the US sought to adopt a battle rifle. Chambered in 7.62x51mm NATO, the AR-10 featured a conventional layout, with a straight-line fiberglass stock and a barrel design optimized for automatic firing, elevated sights, and was made from aluminum, weighing just 6.95 lbs empty. The granddaddy of the famed M16/AR-15 family, the AR-10 was developed in the 1950s by Eugene Stoner, following the trend at the time of select-fire battle rifles firing full-power rifle rounds.
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