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Lewiston Shooter used an Ar-10 rifle, similar to the AR-15 and also invented by Eugene Stoner

Eugene Stoner, the inventor of the much more popular AR-15 in the 1950s, first created an AR-10. The AR-10 fires a larger and more powerful round than the AR-15. As explained in American Gun: The True Story of the AR-15, the U.S. military rejected the AR-10, after it failed critical tests. After the rifle failed important tests, an Army general, Willard Wyman, secretly visited Stoner at his office in southern California and asked him to make a gun very similar to the AR-10 — but with a smaller caliber. Thus was born the AR-15.


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