The RCE includes an RKM14 KeyMod free-floating hand guard with a 1913 Picatinny rail on top. The KeyMod slots are found at the 3, 6 and 9 o’clock positions and offer shooters a low-profile mounting alternative to the M1913 Picatinny rail. For accessories that are not yet KeyMod compatible, users can purchase a separate CMMG 5-slot Picatinny adapter rail that can be easily attached to any of the KeyMod slots for optimal placement of the accessories.
The Mk4 RCE is equipped with a CMMG SV muzzle brake that helps to reduce recoil and increase muzzle control for quick and manageable follow-up shots. The muzzle break is built from nitride finished 4140 steel and is able to withstand harsh conditions while providing steady and consistent muzzle rise compensation.
CMMG Mk4 RCE Specifications:
Caliber: 5.56x45mm NATO / .300 AAC Blackout
Barrel: 16″ medium weight tapered profile, 416 stainless steel, 1:7” twist
Muzzle: CMMG SV muzzle brake, Threaded ½-28
Hand Guard: CMMG RKM14 KeyMod hand guard
Upper Receiver: Forged 7075-T6 AL M4
Lower Receiver: Forged 7075-T6 AL AR15
Trigger: Geissele Automatics SSA 2-stage trigger
Furniture: Magpul MOE Pistol Grip & CTR butt stock
Weight: 6.5 pounds (unloaded), 7.5 pounds (loaded with 30 round PMAG)
Length: 33 inches (stock collapsed), 36 3/8 inches (stock extended)
Magazine: 30rd Magpul PMAG
See more at http://www.cmmginc.com/.