The Mk4 PDW is CMMGs smallest, most compact upper group equipped with the RKM7 KeyMod free floating hand guard and a nitrided 4140 CrMo steel barrel. The Mk4 PDW upper group is available in 300 BLK, 9mm Luger and 22LR; every upper group is covered by CMMGs lifetime quality guarantee. ALL NFA RULES APPLYREAD MORE
When modularity, affordability, and quality are all important the Mk4 T is the upper group of choice. The Mk4 T upper group introduces CMMG’s RKM series of KeyMod free float hand guards. Either a 416 stainless or nitrided 4140 CrMo steel barrel in a medium taper profile are offered for both 5.56mm and 300 BLK. […]READ MORE
The Mk4LE Optics Ready Upper Group is set up for your favorite scope or red dot sight as it has no front sight base to interfere with the sight picture. The Mk4LE OR upper group comes with CMMG’s lifetime quality guarantee.READ MORE
The iconic Mk4LE Upper Group is available in 5.56x45mm, 300 AAC BLK, 9mm Luger and 22LR. They all feature a nitrided 16.1″ 4140 CrMo steel barrel in a M4 profile except the 300 BLK as it features a M300 multi-role barrel profile. The standard configuration includes a “F” marked front sight base.READ MORE
Firearms may only be shipped to a licensed dealer (FFL Holder). Actual buyer must pick up from FFL dealer who will conduct the background check. Some listed items may not be legal in every state. We will not sell firearms to residents of CA or NY. Buyer assumes responsibility of knowing purchase laws in their state. You must be at least 18 years of age to purchase a rifle, and 21 years of age to purchase a handgun or receiver. A CMMG Representative will contact you after your order has been placed to facilitate the transfer.
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