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UPPER RECEIVER GROUP, MODELS LE6921, RO977, RO920.
THE UPPER RECEIVER GROUP CONTAINS A MILITARY GRADE CHROME LINED, 14.5 INCH BARREL ASSEMBLY UTILIZING THE CURRENT 1/7 TWIST RATE (178MM) . THIS ITEM INCLUDES A COLT M4/M4A1 BOLT GROUP AND CHARGING HANDLE.
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