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PRODUCT #60A8653

Endeavor 100 Rifle
Mk4, 6mm ARC


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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.

Endeavor 100 Rifle, Mk4, 6mm ARC

CMMG’s ENDEAVOR designated marksman and distance rifle lineup is designed for superior performance, the ENDEAVOR 100 series rifle chambered in 6mm ARC features a 20-inch barrel so that you can squeeze out every drop of ballistic performance from this exciting new caliber.

Each rifle ships with one 10-round magazine, and features robust furniture and accessories like the CMMG RML15 M-LOK handguard, CMMG A1 fixed stock, A2 pistol grip, and a mil-spec charging handle, along with same the quality components and machine work at the heart of every CMMG rifle. Standard is a black hard coat anodized finish with the option to upgrade to one of 10 Premier Cerakote colors.

Mk4 platform lower receivers accept standard AR15-style magazines, and are the most versatile of the CMMG platforms, especially when paired with the .22 LR, 5.7x28mm, and 9mm conversion magazines and the matching upper receiver group.

All CMMG products come with our Lifetime Quality Guarantee.

Technical Specifications

Platform Mk4
Caliber 6mm ARC
Barrel Length 20
Barrel Twist 01:07.5
Barrel Contour MT
Barrel Material 416SS, SBN
Barrel Twist 01:07.5
Muzzle Device A2 Comp
Muzzle Thread 5/8 X 24
Gas Port Location Rifle
Gas Block 0.750 Non-Adjustable
Upper Receiver Forged 7075-T6 AL M4 type upper
Lower Receiver AR15
Hand Guard CMMG RML15 M-LOK
Finish Hard Coat Anodized Receivers and Hand Guard (Can be upgraded to Cerakote)
Charging Handle CMMG Mil-Spec
Pistol Grip CMMG A2
Receiver Extension CMMG A1 Extension
Stock / Brace CMMG A1 Fixed Stock
Trigger Type Mil-Spec Single Stage
Trigger Guard CMMG Mil-Spec
Safety Selector CMMG Mil-Spec
Magazine 10rd
Weight 7.6

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