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Resolute 100
Mk4, .22 LR


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CMMG is temporarily halting the sale of complete firearms, upper receiver groups, lower receiver groups, and Radial Delayed Blowback BCG kits on our website in order to focus on outstanding orders. We apologize for the inconvenience and appreciate your patience as we traverse this extremely busy time. Sign up for notifications on your favorite products to get notified when they become available again or find a local dealer on our dealer page.


The 100 Series features classic furniture appointments such as the A2 pistol grip and M4 6-position butt stock. Chambered in .22 LR, this AR is ready for the range. The Mk4 lower receiver platform accepts standard AR15-style magazines, and is the most versatile of the CMMG platforms, especially with the .22 LR, 5.7x28mm, and 9mm conversion magazines when paired with a matching upper group.

CMMG’s RESOLUTE rifle and carbine lineup is engineered with purpose for those who refuse to compromise on quality. Each RESOLUTE rifle is designed for balance, accuracy and maneuverability. Available in three tiers —RESOLUTE 100, RESOLUTE 200 and RESOLUTE 300 — that cater to your intended needs and customization. Whether you’re defending your family or looking to bring out your best at the range, the RESOLUTE keeps going when you need it most.

All Products come with CMMG’s Lifetime Quality Guarantee.

Technical Specifications

Platform Mk4
Caliber .22 LR
Barrel Length 17
Barrel Twist 1:16
Barrel Contour MT
Barrel Material 416SS, SBN
Barrel Twist 1:16
Muzzle Device A2 Flash Hider
Muzzle Thread 1/2"-28
Gas Port Location N/A
Gas Block N/A
Upper Receiver Forged 7075-T6 Aluminum M4 Type
Lower Receiver AR15
Hand Guard CMMG RML15 M-LOK
Finish Hard Coat Anodized (can be upgraded to Cerakote)
Charging Handle CMMG 22ARC Mil-Spec style
Pistol Grip CMMG A2
Receiver Extension 6 Position Receiver extension
Stock / Brace CMMG M4
Trigger Type Single Stage Mil-Spec
Trigger Guard CMMG Mil-Spec
Safety Selector CMMG Mil-Spec
Magazine CMMG 25rd
Weight 6.4

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