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This is a Core 15 .223/5.56 NATO TAC M4 Piston 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” M4 Profile Stainless Steel Match Grade 1:7 Twist Barrel. Chambered in .223/5.56 x 45 mm NATO. CORE15 Gas Piston Assembly. Adjustable Gas Settings. Proprietary Monolithic, Melonite Coated Bolt Carrier. Magnetic Particle Inspected (MPI) Bolt Assembly. A-2 Flash Hider. Picatinny flat-top Gas Block (optics ready design). Free Floating Quad Rail. Magpul MOE MBUS Front and Rear Sights. Manufacturers Lifetime Warranty from Core 15.
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