I recently acquired an AR15 and am looking to by a stock for it. How do I determine if it has commercial-spec sized receiver extension tube or a Mil Spec sized receiver extension tube

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James G. · Answer

Robert, an easy how to guide is here Sir  :   https://www.youtube.com/watch?v=IYS_gItHc5E

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I recently acquired an AR15 and am looking to by a stock for it. How do I determine if it has commercial-spec sized receiver extension tube or a Mil Spec sized receiver extension tube