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As the HK416, M-4 and M-16 among others are all based on the Armalite AR-15 I think calling the family of guns AR-15s is fair. As it seems these days AR-15 usually refers to a semi-automatic only civilian version of the gun family some people might not like referring to M-4s and M-16s and the like as AR-15s but I find since so many parts are interchangeable and in the case of airsoft it isn't really life and death it is the best gun family name.
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