This review of the Faxon Firearms ARAK-21 upper receiver assembly highlights its hybrid AR-15/AK-47 design, featuring a long-stroke piston system and a non-reciprocating charging handle. The reviewer details its disassembly, barrel swap capability for different calibers (5.56, .300 Blackout, 7.62x39), and accuracy performance with various ammunition types. While praised for reliability and cleaner operation due to the piston system, its weight and higher optics rail are noted as potential drawbacks.
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