Dealer Login:

Click Here to Become a Dealer

RSR Stock #: CMMG54A40BE-AB
Manufacturer Part #: 54A40BE-AB
UPC: 810046238325

View High Resolution Image
View High Resolution Image

CMMG, Resolute MK4, Semi-automatic Rifle, 5.7X28MM, 16.1" Barrel, Threaded 1/2x28, ZEREOED SR Brake, Cerakote Finish, Armor Black, 15" Free Float M-LOK Handguard, ZEROED Polymer Grip, CMMG Ripstock, Manual Safety, 32 Rounds, 1 Magazine


WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to


"GLOCK” is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.m.b.H.  Neither RSR Group, Inc. nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H.  The use of “GLOCK” on this page is merely to advertise the sale of GLOCK pistols, parts, or components.  For genuine GLOCK, Inc. and GLOCK Ges.m.b.H. products and parts visit

  • ZEROED Pistol Grip
  • ZEROED Trigger Guard
  • ZEROED 60 degree/90 degree Ambi Safety
  • ZEROED AR15 Ambi Charging Handle
  • ZEROED Ambi Mag Catch
  • ZEROED Extended Mag Release Button
  • ZEROED AR15 Bolt Catch
  • ZEROED AR15 Polymer Dust Cover
  • ZEROED Muzzle Brake 5.56mm

Product Description

Demand for personal defense weapons chambered in calibers like 5.7x28mm has been steadily growing over the years but picking the right platform can be a tough decision. If the modularity of the Mk4 - AR15 platform piques your interest, then this RESOLUTE Mk4 in 5.7x28mm is the thing for you. Instead of using pistol magazines, this RESOLUTE uses CMMG's new generation of 5.7 magazines that fit standard AR15 magwells for maximum modularity.