BudsGunShop.com - Mil Spec AR-15?
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Is the Colt AR15A4 a standard Mil Spec Rifle? IS the upper and or lower fit and function with other manufacturer's components?
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Unless it is a true M4 or M16 rifle with select fire then it isn't 100% per military specifications. Don't worry too much about Mill Spec, most Lowers are made by the same companies and are branded differently.