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Colt M16 A4 Factory Flattop Heavy Barrel New in Box with accessories. One of very few transferable, factory-built M16A4s made by Colt and finished in black. Colt-confirmed, 2008 factory manufactured RO-901 M16A4. Built on virgin pre-86 A2 receiver by special order. Your only opportunity to buy a transferable latest-model M16A4.