CMMG Resolute 300 Mk57 5.7×28 AR-15 Semi Auto Rifle 16.1″ Barrel 20 Rounds RML15 M-LOK Free Float Hand Guard Cerakote Midnight Bronze



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  • Return to manufacturer for warranty service.
  • Firearms are only available for purchase online.

Due to high volume, some firearms may require up to 2 weeks to process.

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The CMMG Resolute now Comes Chambered in the Amazing 5.7×28 Cartridge

For over a decade CMMG has remained committed to producing some of the best AR platform firearms in the industry. The Resolute 300 is the ideal multi-purpose firearm from CMMG with all of the features you’re looking for in an AR15 rifle. New for 2020 is the renaissance of the 5.7×28 cartridge which this particular AR-15 rifle is now chambered in. With a 416 stainless steel barrel, free float M-LOK compatible hand guard and a Geissele Automatics SSA 2-Stage Trigger what more could you ask for? Whether you like plinking for recreational shooting, need a reliable gun for varmint hunting and pest control, or rifle to protect your home and family, the Mk57 Resolute 300 from CMMG is the only gun you’ll need!

CMMG Resolute 300 Mk57 AR -15 Semi Auto Rifle (Midnight Bronze) Specifications and Features:

  • AR-15 Style Semi Automatic Rifle
  • 5.7×28
  • 16.1″ 416 Stainless Steel Medium Taper Barrel
  • Threaded Muzzle 1/2×28
  • SV Muzzle Device
  • Forged 7075-T6 Aluminum Receivers
  • Standard AR-15 Lower Receiver
  • 20 Round ProMag 5.7×28 Pistol Magazine
  • CMMG RML15 M-LOK Free Float Hand Guard
  • CMMG Oversized Charging Handle
  • CMMG Ripstock with 6 Position Enhanced Receiver Extension
  • Magpul MOE Pistol Grip
  • Geissele Automatics SSA 2-Stage Trigger
  • Magpul MOE Trigger Guard
  • CMMG Ambidextrous Safety Selector
  • Overall Weight 6lbs 1oz
  • Overall Length 32.8″
  • Made in the USA
  • Cerakote Finish
  • Midnight Bronze
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