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Barrel: Ground Zero Precision Lightning Series 7.5 inch 300 Blackout chambered barrel is precision CNC machined from 4150 CrMoV steel and fitted with a perfectly aligned M4 feed ramp extension. Upper Receiver: Aero Precision's AR15 upper receivers are one of our most popular products. Forged from 7075-T6 aluminum, this upper is precision machined to mil-spec M16/M4 specifications and features M4 feedramps. from Ground Zero Precision (Product 75300BTFK)

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