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Upper Group, Mk4LE, 5.56mm
Our Price: $624.95

Our basic rifle, the Mk4 LE features a nitrided 16.1" 4140 CrMo steel barrel in a M4 barrel profile. The standard configuration includes a "F" marked front sight base and M4 style hand guards.
Upper Group, Mk4LE OR, 5.56mm
Our Price: $624.95

The Mk4LE Optics Ready model 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 comes with CMMG's lifetime quality guarantee.
Upper Group, Mk4LEM, 5.56mm
Our Price: $649.95

Similar in configuration to our Mk4LE, except for the barrel and hand guard, the Mk4 LEM features a nitrided 16" 4140 CrMo steel 5.56x45mm barrel with our mid-length medium taper barrel profile. The mid-length gas system offers a longer sight radius and operates a bit smoother. The medium taper profile optimizes the strength of the barrel while reducing and repositioning the weight of the rifle a for handy and quick swinging feel.
Upper Group, Mk4 T, 5.56mm, SBN
Our Price: $699.95

When modularity, affordability, and quality are all important the Mk4 T is the upper of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free float hand guards and a nitrided 4140 CrMo steel barrel in a medium taper profile.
Upper Group, Mk4 T, 5.56mm
Our Price: $749.95

When modularity, affordability, and quality are all important the Mk4 T is the upper of choice. The Mk4 T introduces CMMG's RKM series of KeyMod free float hand guards and a 416 stainless Steel barrel in a medium taper profile.
Upper Group, Mk4 HT, 5.56mm, SBN
Our Price: $749.95

When modularity, accuracy and quality are all important, the Mk4 HT is the upper of choice. The Mk4 HT features CMMG's RKM11 KeyMod free float hand guard. a nitrided 4140 CrMo steel barrel in a heavy taper profile. This model is also available with a piston operating system and RKM9 hand guard.
Upper Group, Mk4 K, 5.56mm
Our Price: $774.95

The Mk4 K is CMMG’s primary short barreled upper. The Mk4 K includes the RKM11 KeyMod free floating hand guard, a nitrided 4140 CrMo steel 12.5” barrel, and CMMG’s lifetime quality guarantee.
Upper Group, Mk4 S, 5.56mm
Our Price: $799.95

The Mk4 S is the perfect upper for the tree stand or target range. The Mk4 S utilizes an 18" 416 stainless steel medium taper barrel and CMMG's RKM14 KeyMod hand guard. The uppers's KeyMod hand guard is ready to accept any number of the sling mounts, bi-pods and other KeyMod compatible accessories making the ultimate in versatility and modularity.  Each upper includes CMMG's lifetime quality guarantee.
Upper Group, Mk4, 5.56mm
Our Price: $799.95

The Mk4 upper has our 14.5" chrome lined barrel which is built to the exact same specifications as the barrels used in the military's M4 carbines. The extended A2 compensator is permanently attached in order to meet the legal minimum length requirements. Like all CMMG products it features our lifetime quality guarantee.
Upper Group, Mk4 HT, 5.56mm
Our Price: $799.95

When modularity, accuracy and quality are all important, the Mk4 HT is the rifle of choice. The Mk4 HT features CMMG's RKM11 KeyMod free float hand guard, a 416 stainless steel barrel in a heavy taper profile. This model is also offered with a piston operating system and RKM9 hand guard.