CMMG Resolute 100 Mk4 .300 AAC Blackout AR-15 Complete Upper Receiver Assembly 16" Barrel A2 Comp RML15 Free Float M-LOK Hand Guard Black Finish

Item No. 2-CMMG30B12AC
  • In Stock
Our Low Price $713.05
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Brand: CMMG, Inc.
MFR #: 30B12AC
UPC: 816422026555
Item #: 2-CMMG30B12AC
Typically ships within 5 to 7 business days
For over a decade CMMG has remained committed to producing some of the best AR platform firearms in the industry. The Resolute 100 Mk4 complete upper receiver assembly comes with everything you need to connect directly to an existing AR-15 lower receiver. This upper is designed to be compatible with Mil-spec pattern AR-15 lower receivers. Whether you like plinking for recreational shooting, need a reliable gun for varmint and pest control the Mk4 Resolute 100 complete upper receiver assembly from CMMG is the only upper you need!

Specifications and Features:
CMMG Inc. Resolute Mk4 AR-15 Complete Upper Receiver Assembly 30B12AC
Direct Gas Impingement System, Pistol Length
.300 AAC Blackout
16" 4140 Chrome-moly barrel with Salt Bath Nitride Finish
Medium Taper Profile Barrel
1:7" Twist Rate
Threaded 5/8x24
CMMG A2 Muzzle Device
Forged 7075-T6 Aluminum Upper Receiver
Complete Bolt Carrier Group
CMMG RML15 M-LOK Free Float Hand Guard
CMMG Mil-Spec Charging Handle
Overall Length 25.2"
Overall Weight 4lbs 5oz
Made In The USA
Hard Coat Anodized Finish

Mil-Spec pattern AR-15 Lower Receivers


This product can expose you to chemicals including lead. Which is known to the State of California to cause cancer. For more information, go to