The AAI XM70 is an American assault rifle developed by the AAI Corporation that fires 5.56 mm flechette rounds. The XM70 was considered as an entry into the 1970s Future Rifle Program to replace the long serving M16 rifle; however, due to the high cost of manufacture, the AAI SBR was chosen instead.
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The original article can be found at AAI XM70 and the edit history here.