CMMG Mk4 Endeavor Upper Receiver Group 5.56x45mm NATO 18in Armor Black

CMMG Mk4 Endeavor Upper Receiver Group 5.56x45mm NATO 18in Armor Black. 56mm the ENDEAVOR Mk4 Upper Group is here. Perfect for new builds or for use with an existing AR15 lower receiver this upper utilizes an 18 416 stainless steel barrel with a nitride finish for enhanced ballistic performance and superior durability. Specifications for CMMG Mk4 Endeavor Upper Receiver Group: Manufacturer: CMMG Caliber: 5.56x45mm NATO Overall Length: 26.9 in Barrel Length: 18 in Barrel Profile: Medium Taper Gas System Length: Rifle Length Barrel Twist Rate: 1-7 Muzzle Device: CMMG Zeroed Muzzle Brake Color: Armor Black Fabric/Material: 416SS Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk4 Weight: 4.5 lb Magazine Included: No Condition: New Mount Type: M-LOK Threads per Inch: 1/2x28 Package Contents: CMMG Mk4 Endeavor Upper Receiver Group What firearm models does the manufacturer say CMMG Mk4 Endeavor Upper Receiver Group is compatible with? The manufacturer suggests that CMMG Mk4 Endeavor Upper Receiver Group is compatible with CMMG Mk4CMMG 55BFDAB-AB: Mk4 Endeavor Upper Receiver Group 5.56x45mm NATO 18in Armor Black