CMMG Endeavor MK4 Complete AR-15 Upper Receiver, .22 ARC 20in Barrel, 28B3D0CAB

Product Description The CMMG Endeavor MK4 Complete Upper Group is built to deliver consistent performance from the AR-15 platform in .22 ARC (Advanced Rifle Cartridge). This complete upper features a 20-inch 4140 chrome moly steel barrel with a salt bath nitride finish, a rifle-length gas system with an adjustable gas block, and an optics-ready Picatinny top rail. Finished in Armor Black, it includes CMMG components such as the EML15 M-LOK handguard, bolt carrier group, and a Zeroed ambidextrous charging handle, making it a strong choice for long-range hunting, precision shooting, and AR build projects. Product Highlights .22 ARC (Advanced Rifle Cartridge) complete AR-15 upper receiver group designed for consistent function 20 inch 4140 chrome moly steel barrel with salt bath nitride finish for durability Rifle-length gas system with adjustable gas block for tuning and reliability EML15 M-LOK handguard with optics-ready Picatinny rail for accessories and sights Includes CMMG bolt carrier group and Zeroed ambidextrous charging handle (magazine not included) Specs Brand: CMMG Manufacturer Part Number: 28B3D0CAB UPC: 810148627393 Platform: AR-15 (Mk4 upper group) Caliber: .22 ARC (Advanced Rifle Cartridge) Barrel Length: 20 in Barrel Material: 4140 chrome moly steel Barrel Finish: Salt bath nitride Twist Rate: 1:7 Gas System: Rifle length Gas Block: Adjustable Upper Receiver Material: Billet 6061-T6 aluminum Handguard: CMMG EML15 M-LOK Muzzle Threads: 1/2×28 Muzzle Device: CMMG Zeroed muzzle brake Charging Handle: CMMG Zeroed ambidextrous Dust Cover: CMMG Zeroed polymer Finish/Color: Armor Black (Cerakote) Overall Length: 28.9 in Weight: 4.7 lb Magazine Included: No Compatibility: Mil-spec AR-15 lower receivers; CMMG Mk4 lower receivers Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&’;s manufacturer.