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: 1/2x28
- 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
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