M4 Feed Ramp Barrel Extension (USGI) M4 Feed Ramp Flat Top Receiver T-Marked Upper Receiver 1/8 Twist Rate 5.56 NATO 410 Stainless Steel HPT (High Pressure Test) Barrel MPI (Magnetic Particle Inspected) Barrel from Bravo Company USA (Product BCM-URG-MID16-SS410-C4-12)

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