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Rifling twist‎: ‎1:7

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1 in 7 Twist : (Specifications and Features): - CMMG Complete Upper Receiver 30B129A - .300 AAC Blackout - 16" 4140 Chrome-Moly steel medium taper profile - 1:7 Twist - Threaded 5/8x24 - RKM11 KeyMod hand guard - Forged 7075-T6 Aluminum M4 Type Upper - CMMG A2 Compensator - Bolt carrier group - Charging Handle - Matte black.

1:7 CMMG Complete Upper Receiver 30B129A - .300 AAC Blackout - 16" 4140 Chrome-Moly steel medium taper profile -********** 1:7 Twist -********** Threaded 5/8x24 - RKM11 KeyMod hand guard - Forged 7075-T6 Aluminum M4 Type Upper - CMMG A2 Compensator - Bolt carrier group - Charging Handle - Matte black.

Hi Charles, Twist : 1:7" SPECS --300 AAC Blackout/Whisper (7.62x35mm) Sights : None, Optic Ready Barrel Length : 16" Barrel Material : 4140 Steel>>>>>> Twist : 1:7" Barrel Description : Medium Taper Barrel Finish : Black Receiver

1:7 CMMG Complete Upper Receiver 30B129A - .300 AAC Blackout - 16" 4140 Chrome-Moly steel medium taper profile -********** 1:7 Twist -********** Threaded 5/8x24 - RKM11 KeyMod hand guard - Forged 7075-T6 Aluminum M4 Type Upper - CMMG A2 Compensator - Bolt carrier group - Charging Handle - Matte black.