CMMG Mk4 Endeavor Upper Receiver Group

For those looking to reach out further with 5.56mm, 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 Cartridge: 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 Threads per Inch: 1/2×28 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 Condition: New Magazine Included: No Mount Type: M-LOK Package Contents: CMMG Mk4 Endeavor Upper Receiver Group