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The modular design of the AR rifle is a big part of its enormous popularity. By simply popping the takedown pins and switching the upper receiver assembly an AR owner can switch from a .22 long rifle ...

I tested MMC Armory’s Tactical Upper Receiver in 5.56. This model comes in two lengths, 14.7“ and 16.1”. It is the same upper that goes on MMC Armory’s Tactical C14.7 rifle, which is basically a ...