The CMMG 38B92B3 Upper Group, Mk3 K, 308 WIN is CMMG’s primary short barreled Upper Group. The CMMG 38B92B3 Upper Group, Mk3 K, 308 WIN includes the RKM11 KeyMod free floating hand guard. The barrel is a nitrided 4140 CrMo steel, 12.5″ long barrel chambered in 308 WIN. Each upper group includes CMMG’s lifetime quality guarantee. ALL NFA RULES APPLY.

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The CMMG 38BCCE5 Upper Group, Mk3, 3GR, 308 WIN was developed for the heavy metal class 3-Gun shooter, but is just as well suited in the field as it is on the range. The CMMG 38BCCE5 Upper Group, Mk3, 3GR, 308 WIN features an 18″ 416 stainless steel, heavy taper profile, 308 WIN barrel. This Upper Group is equipped with CMMG’s SV muzzle brake and RKM15 KeyMod hand guard.

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The CMMG 38BEAAD Upper Group, Mk3 T, 308 WIN is equipped with CMMG’s RKM15 KeyMod free float hand guard. The CMMG 38BEAAD Upper Group, Mk3 T, 308 WIN has a nitrided 416 stainless steel, 16″ medium taper profile barrel in 308 WIN. Each upper group includes CMMG’s lifetime quality guarantee.

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The CMMG 38BCC38 Upper Group, Mk3, 308 WIN is the perfect 308 WIN Upper Group for the tree stand or target range. The CMMG 38BCC38 Upper Group, Mk3, 308 WIN utilizes an 18″ 416 stainless steel heavy taper barrel, and CMMG’s RKM15 KeyMod hand guard. Each Upper Group is covered by CMMG’s lifetime quality guarantee.

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The classic AR15 Upper Group configuration, based on the M16A4. The CMMG 55B2140 Mk4 A4 Upper Group’s defining characteristic is its 20″ government profile barrel. The 5.56mm barrel is chrome-lined and built to the military’s stringent specifications.

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The CMMG 55B66C7 Mk4 3GR Upper Group features an 18″ 416 stainless steel medium taper profile 5.56x45mm barrel. This Upper Group is equipped with CMMG’s SV muzzle brake and RKM14 KeyMod hand guard.

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The CMMG 30B8A67 Upper Group, Mk4 K, 300 BLK includes the RKM11 KeyMod free floating hand guard. The barrel is a nitrided 4140 CrMo steel 12.5″ barrel available in both 5.56x45mm and 300 AAC Blackout. Each CMMG 30B8A67 Upper Group, Mk4 K, 300 BLK is covered by CMMG’s lifetime quality guarantee.

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The CMMG 30B2C4E Upper Group, Mk4 HT, 300 BLK features CMMG’s RKM11 KeyMod free float hand guard. The CMMG 30B2C4E Upper Group, Mk4 HT, 300 BLK has a 416 stainless steel barrel in a heavy taper profile in a 300 Blackout format.

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The CMMG 55B9127 Upper Group, Mk4 HT, 5.56mm features CMMG’s RKM11 KeyMod free float hand guard. The CMMG 55B9127 Upper Group, Mk4 HT, 5.56mm has a 416 stainless steel barrel in a heavy taper profile in a 5.56mm format.

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The CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN features CMMG’s RKM11 KeyMod free float hand guard. The CMMG 30B442D Upper Group, Mk4 HT, 300 BLK, SBN has a nitrided 4140 CrMo steel barrel in a heavy taper profile in a 300 Blackout format.

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