RESOLUTE® MK4 300 BLACKOUT ASSEMBLED UPPER RECEIVER W/P&W BRAKE – RESOLUTE MK4 300BLK ASSEMBL UPPER 14.5”BBL W/P&W BRAKE BLK

Specifications

  • Cartridge: 300 AAC Blackout
  • Make: AR-15
  • Style: Assembled
  • Make/Model: AR-15
  • Twist: 1-7
  • Muzzle: 1/2-28
  • Finish: Black Cerakote
  • Color: Black
CMMG RESOLUTE® MK4 300BLK ASSEMBLED UPPER RECEIVER W/P&W BRAKE
 
The carbine upper that keeps it simple. Chambered in 300BLK, this RESOLUTE upper group's 14.5" barrel comes with the ZEROED SVD muzzle brake pinned & welded to the muzzle. This is the perfect choice when you want to go as short as possible while still meeting overall length requirements for rifle barrels, so no NFA rules or SBR registration.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 300BLK
  • Operating System: Direct Impingement
  • Barrel Length: 14.5"
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG ZEROED SVD Brake Pinned & Welded
  • 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 EML13.5 M-LOK
  • Finish: Cerakote
  • Weight: 4.1 lbs
  • Length: 23.8"
Description

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

CMMG RESOLUTE® MK4 300BLK ASSEMBLED UPPER RECEIVER W/P&W BRAKE
 
The carbine upper that keeps it simple. Chambered in 300BLK, this RESOLUTE upper group's 14.5" barrel comes with the ZEROED SVD muzzle brake pinned & welded to the muzzle. This is the perfect choice when you want to go as short as possible while still meeting overall length requirements for rifle barrels, so no NFA rules or SBR registration.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 300BLK
  • Operating System: Direct Impingement
  • Barrel Length: 14.5"
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG ZEROED SVD Brake Pinned & Welded
  • 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 EML13.5 M-LOK
  • Finish: Cerakote
  • Weight: 4.1 lbs
  • Length: 23.8"

2 in stock

SKU 430114935 Category

Description

CMMG RESOLUTE® MK4 300BLK ASSEMBLED UPPER RECEIVER W/P&W BRAKE
 
The carbine upper that keeps it simple. Chambered in 300BLK, this RESOLUTE upper group's 14.5" barrel comes with the ZEROED SVD muzzle brake pinned & welded to the muzzle. This is the perfect choice when you want to go as short as possible while still meeting overall length requirements for rifle barrels, so no NFA rules or SBR registration.
 
This upper group does NOT include BCG or charging handle.
 
SPECS
  • Platform: Mk4
  • Caliber: 300BLK
  • Operating System: Direct Impingement
  • Barrel Length: 14.5"
  • Barrel Twist: 1:7
  • Barrel Contour: MT
  • Barrel Material: 4140CM, SBN
  • Muzzle Device: CMMG ZEROED SVD Brake Pinned & Welded
  • 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 EML13.5 M-LOK
  • Finish: Cerakote
  • Weight: 4.1 lbs
  • Length: 23.8"

Additional information

Weight 4 lbs
Cartridge

CCP_300 AAC Blackout

Make

AR-15

Style

Assembled

Make/Model

AR-15

Twist

1-7

Muzzle

1/2-28

Finish

Black Cerakote

Color

Black

Length

14.5''

Contour

MT

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.