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ARMALITE AR-30M rifle in .308 Winchester cal.
Model: 30M308. Barrel: 26" Chome Moly, 6 Groove. Rifling Twist: RH 1:10". Muzzle Device: Highly Efficient Multi-Flute. Upper Receiver: Modified Octagonal Form, Drilled and Slotted for MIL STD Scope Rail with Boss to Engage Cross-Slot on Receiver...