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Product Info for CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver

Start your new bufferless build or add to the options for your existing DISSENT lower with the 14.5" 300BLK upper group. Although the barrel is only 14.5" long, this upper comes with the ZEROED SVD brake pinned and welded to the end, bringing the total length to 16.1", allowing the use of stocks and braces without having to SBR anything.image

Utilizing our patent pending direct impingement Compact Action, DISSENT upper groups house the entire action and recoil assembly in the upper receiver resulting in less bulk and length than traditional ARs. The forward non-reciprocating side charger allows for quick bolt operation without coming off target. Direct impingement DISSENTS come equipped with a left side charger standard. Right side charging handles for DI models are available here.

All DISSENT Upper groups include a lower receiver end plate and choice of adapter including: 1913 Picatinny rail, buffer tube adapter, or DISSENT folding stock. DISSENT Upper groups are available in your choice from seven Cerakote finish options or hard coat anodized.

Specifications for CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver:

Manufacturer: CMMG
Caliber: .300 AAC Blackout
Overall Length: 23.6 in
Barrel Length: 14.5 in
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 5/8x24
Muzzle Device: CMMG Zeroed Muzzle Brake
Finish: Cerakote
Fabric/Material: Aluminum
Gas Block Journal Size-Diameter: .750 in
Handguard Style: M-LOK w/ Top Picatinny Rail System
Gun Rail: M-LOK
Gun Make: CMMG
Weight: 4 lb
Gas System Type: Direct Impingement
Magazine Included: No

Package Contents:

  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver

CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver Orderable Models

List of Orderable Models

  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Armor Black, 30BA30F-AB , MPN: 30BA30F-AB , Code: 2CM-URC-F8C9F12F-30BA30F-AB
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Coyote Tan, 30BA30F-CT , MPN: 30BA30F-CT , Code: 2CM-URC-F8C9F12F-30BA30F-CT
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Midnight Bronze, 30BA30F-MB , MPN: 30BA30F-MB , Code: 2CM-URC-F8C9F12F-30BA30F-MB
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Tungsten, 30BA30F-TNG , MPN: 30BA30F-TNG , Code: 2CM-URC-F8C9F12F-30BA30F-TNG

CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Anodized Black, 30BA30F-HCA , MPN: 30BA30F-HCA , Code: 2CM-URC-F8C9F12F-30BA30F-HCA
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Charcoal Green, 30BA30F-CG , MPN: 30BA30F-CG , Code: 2CM-URC-F8C9F12F-30BA30F-CG
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Sniper Grey, 30BA30F-SG , MPN: 30BA30F-SG , Code: 2CM-URC-F8C9F12F-30BA30F-SG
  • CMMG DISSENT Mk4, 300BLK, 14.5in P&W Upper Receiver, 1-7 Twist, 5/8 X 24 TPI, .750in, 23.6in, Titanium, 30BA30F-TI , MPN: 30BA30F-TI , Code: 2CM-URC-F8C9F12F-30BA30F-TI
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Last updated 2026-07-10 UTC.