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This is a Rock River Arms .458 SOCOM CAR A4 Complete Upper. Includes bolt carrier group and charging handle assembly. Caliber .458 SOCOM Chamber, Forged A4 barrel, 16 inch Chrome Moly Bull Barrel, 1:14 twist. A2 Flash Hider/ 5/8 - 32 Thread, Varmint Gas Block with Sight Rail. RRA Aluminum Free Float Tube, CAR Length. Always load from a magazine. Do not load singly through the ejection port. Includes .458 Enhanced Action Springs to reduce recoil and enhance feeding/reliability.
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