This is a Core 15 .223/5.56 NATO M4 16" Barrel Twist 1x7 Complete Upper. CORE15 Mil-Spec Forged 7075-T6 M-4 Upper Receiver, Type III Class II Hard-coat anodized finish, M4 Feed Ramps, (1913 Picatinny rail flat top) w/ dry lube internal finish and laser engraved T-markings. 16” 4150 CMV Chrome Moly M4 Profile Chrome Lined Barrel 1:7 Twist. Chambered in .223/5.56 x 45 mm NATO. Direct Gas Impingement Gas System. Gas tube made of 304 grade Stainless Steel. Chrome lined Steel Bolt Carrier and Bolt Carrier Key. Magnetic Particle Inspected (MPI) Bolt Assembly. A-2 Flash Hider. M-4 Style Thermoset molded Polymer Hand Guards with Dual Heat Shields. A Frame Front Sight Base (Forged). Manufacturers Lifetime Warranty from Core 15.
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