The Mk4 K PSB 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. The PSB features the KAK Shockwave Stabilizing Arm brace to improve controllability. Each rifle includes Magpul MOE pistol grip and trigger guard, along with a […]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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