CMMG Dissent 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black
$1,024.99 at GunMag Warehouse · 4 stores
In stock
CMMG DISSENT Mk4 300BLK 14.5in P&W Upper Receiver 1-7 Twist 5/8 X 24 TPI .750in 23.6in Midnight Bronze
No ratings yetBest price
$1,299.00at OpticsPlanet
Out of stock Sale checked Oct 23, 2026
In stock now instead
- CMMG Dissent 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate … $1,024.99at GunMag Warehouse
- CMMG Dissent 10.50" Upper .300 AAC Blackout with 1:7 Twist Rate… $1,024.99at GunMag Warehouse
- Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout… $1,255.50at MidwayUSA
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $1,299.00Salechecked Oct 23, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
CMMG Dissent 10.50" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black
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Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout 8.5 inch Upper Receiver Pistol Length 1-7 Twist 5/8x24 HATEBRAKE Black
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Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver Pistol Length 1-8 Twist 5/8x24 HATEBRAKE Black
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Price history
Dashed line = out of stock. Tracking since Oct 13, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $1,299.00 | $1,299.00 | $1,299.00 |
Since Oct 13, 2026.
About this part
The CMMG DISSENT Mk4 300BLK 14.5in P&W Upper Receiver 1-7 Twist 5/8 X 24 TPI .750in 23.6in Midnight Bronze is a 14.5" 300 Blackout upper receiver from CMMG. One store lists it, OpticsPlanet at $1,299.00.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Muzzle thread
- 5/8x24 · Muzzle devices
- Barrel length
- 14.5" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Bronze
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
CMMG DISSENT Mk4 300BLK 14.5in P&W Upper Receiver 1-7 Twist 5/8 X 24 TPI .750in 23.6in Midnight Bronze. 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. 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 30BA30F-MB: DISSENT Mk4 300BLK 14.5in P&W Upper Receiver 1-7 Twist 5/8 X 24 TPI .750in 23.6in Midnight Bronze
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