CMMG AR-15 Resolute 300 Mk4 Upper Receiver Assembly 350 Legend 16.1″ Barrel M-LOK Handguard


Category: Product ID: 13223


CMMG’s Resolute is engineered with purpose for those who refuse to compromise on quality. The Resolute features a medium tapered barrel designed for balance, accuracy and maneuverability. The Resolute offers a billet 6061 T6 Aluminum upper receiver assembly with a bolt carrier group, and a Cerakoted receiver and handguard. Whether it’s hunting, personal defense, or target shooting, this RESOLUTE Upper Group is just the thing to finish your next carbine build. This upper is designed to work with any standard AR15 lower.



  • ZEROED AR15 Polymer Dust Cover
  • ZEROED AR15 Ambi Charging Handle
  • ZEROED Muzzle Brake

Made In United States of America


Product Information

Cartridge 350 Legend
Color Armor Black
Finish Cerakote
Material Aluminum
Weight 4 Pound
Barrel Length 16.1 Inches
Twist 1:16 Inches
Threads 1/2″-28
Barrel Contour Medium
Barrel Finish Black Salt Bath Nitride
Chrome Lined No
Gas Block Diameter 0.75 Inches
Gas System Length Carbine
Upper Receiver Type A3 Flat-Top
Barrel Material 4140 Chrome Moly Steel
Handguard CMMG EML15 M-LOK
Bolt Carrier Assembly Included Yes
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight 4.635 Pounds


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