RESOLUTE® MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER – RESOLUTE MK4 5.56 NATO ASSEMBLED UPPER RCVR 16.1” BBL BLACK

Specifications

  • Cartridge: 5.56 x 45
  • Make: AR-15
  • Finish: Black Cerakote
  • Contour: MT
  • Make/Model: AR-15
  • Twist: 1-7
  • Muzzle: 1/2-28
  • Style: Assembled
CMMG RESOLUTE MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER
 
Top off your next build with this RESOLUTE® Mk4 Upper Group. Chambered in 5.56x45mm, this upper group is a staple for any collection.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 5.56x45mm
  • Operating System: Direct Impingement
  • Barrel Length: 16.1”
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG A2 Flash Hider
  • Muzzle Thread: 1/2 x 28
  • Gas Port Location: Mid
  • Gas Block: Non-Adjustable 0.750”
  • Upper Receiver: Billet 6061 T6 Aluminum
  • Hand Guard: CMMG EML15 M-LOK
  • Finish: Cerakote
  • Weight: 3.6 lbs
  • Length: 25”
Description

Original price was: $595.38.Current price is: $450.00.

CMMG RESOLUTE MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER
 
Top off your next build with this RESOLUTE® Mk4 Upper Group. Chambered in 5.56x45mm, this upper group is a staple for any collection.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 5.56x45mm
  • Operating System: Direct Impingement
  • Barrel Length: 16.1”
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG A2 Flash Hider
  • Muzzle Thread: 1/2 x 28
  • Gas Port Location: Mid
  • Gas Block: Non-Adjustable 0.750”
  • Upper Receiver: Billet 6061 T6 Aluminum
  • Hand Guard: CMMG EML15 M-LOK
  • Finish: Cerakote
  • Weight: 3.6 lbs
  • Length: 25”

3 in stock

SKU 430114934 Category

Description

CMMG RESOLUTE MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER
 
Top off your next build with this RESOLUTE® Mk4 Upper Group. Chambered in 5.56x45mm, this upper group is a staple for any collection.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 5.56x45mm
  • Operating System: Direct Impingement
  • Barrel Length: 16.1”
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG A2 Flash Hider
  • Muzzle Thread: 1/2 x 28
  • Gas Port Location: Mid
  • Gas Block: Non-Adjustable 0.750”
  • Upper Receiver: Billet 6061 T6 Aluminum
  • Hand Guard: CMMG EML15 M-LOK
  • Finish: Cerakote
  • Weight: 3.6 lbs
  • Length: 25”

Additional information

Weight 5 lbs
Make

AR-15

Finish

Black Cerakote

Contour

MT

Make/Model

AR-15

Twist

1-7

Cartridge

AKK_5.56 x 45

Muzzle

1/2-28

Style

Assembled

Length

16.1''

Color

Black

Frequently Asked Questions

Are these brass cases and reloading components factory-new or once-fired? +

We stock both premium factory-new components and high-quality once-fired brass. Please check the specific product listing title and description carefully; once-fired brass is fully inspected, but we always recommend resizing and inspecting prior to priming and powder charging.

Will this case trimmer gauge or die set work with my progressive press setup? +

Our standard reloading dies and case length trimmer accessories utilize industry-standard threads (typically 7/8"-14) compatible with major single-stage, turret, and progressive presses like RCBS, Hornady, Lee Precision, and Dillon. Caliber-specific trim gauges must match your exact brass caliber.

Do you enforce shipping restrictions on powder, primers, or live ammunition? +

Yes. Non-hazardous reloading equipment (dies, case length trimmers, gauges, and unprimed brass) ships via standard ground carriers with no extra fees. Any orders containing smokeless powders or primers will incur standard federal HazMat handling fees and cannot be shipped via air transportation.

How can I track my shipment to ensure delivery safety? +

Precision reloading gear is valuable, so all orders are shipped with tracking enabled. As soon as your package is dispatched from our inventory warehouse, a tracking number will be emailed to you. You can monitor your shipment directly on our Track Order page using your unique Order ID.

Can I return precision measuring tools or die components if they don’t fit? +

We accept returns on unused, unaltered tools, case preparation equipment, and unopened component boxes within 30 days of item delivery. Due to safety and strict quality control on the reloading bench, we absolutely cannot accept returns on opened packs of primers, smokeless powder, or processed brass casings.