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I have finished my latest AR build and have another lower ready to go. While I am eventually wanting to build a 300 blk, I really love the x39 round and would love to build an AR with the x39 upper. Trouble is, I have yet to find an upper that is reliable (according to the "experts". Does such a creature exist, or are they out there with Unicorns and such? Your thoughts and experiences would be appreciated!