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Rock River Arms
Rock River Arms Completed Upper Receiver, X-1 .308/7.62x51mm, 18 Inch Barrel, 1-10 Twist, 5/8-24 Threat, Free-Float Handguard, Brake, Tan, X308A0700T.V1
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CMMG
CMMG MkGs Resolute Upper Receiver Group, .40 S&W, 16.1in, Armor Black, 40B9894-AB
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CMMG
CMMG Mk4 5.7X28mm Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 57B40E4-MB
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CMMG
CMMG Upper Group, Resolute, Fixed Ejector, MkG, . 45 ACP, 16.1in, 1-16 Twist, 0.578-28 TPI, Armor Black, 45B690F-AB
Upper Receiver$910
CMMG
CMMG Upper Group, Resolute, Fixed Ejector, 9mm, 16.1in, 1-10 Twist, 1/2 X 28 TPI, 25.3in, Tungsten, 99BA20F-TNG
Upper Receiver$910
CMMG
CMMG Upper Group, Resolute, Fixed Ejector, MkG, . 45 ACP, 16.1in, 1-16 Twist, 0.578-28 TPI, Tungsten, 45B690F-TNG
Upper Receiver$910