CMMG Resolute Mk3 8.6 Blackout 16.1 inch Upper Receiver 1-3 Twist 5/8 x 24 CMMG ZEROED Muzzle Brake Cerakote Armor Black
$905.99 at Ammunition Depot · 3 stores
In stock
CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Armor Black
No ratings yetBest price
$789.99at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- CMMG Resolute Mk3 8.6 Blackout 16.1 inch Upper Receiver 1-3 Twi… $905.99at Ammunition Depot
- CMMG Dissent 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate … $1,024.99at GunMag Warehouse
- Dark Storm Industries DS-15 AR-15 .300 AAC Blackout 12.5 inch U… $799.95at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $789.99Salechecked Oct 22, 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 6.50" Upper .300 AAC Blackout with 1:7 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black
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Dark Storm Industries DS-15 AR-15 .300 AAC Blackout 12.5 inch Upper Receiver SOCOM Profile Pistol Length 1-7 Twist Firestorm Compensator Magpul MVG
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Price history
Dashed line = out of stock. Tracking since Oct 14, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $789.99 | $789.99 | $789.99 |
Since Oct 14, 2026.
About this part
The CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Armor Black is an 8" 300 Blackout upper receiver from CMMG. One store lists it, OpticsPlanet at $789.99.
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
- 8" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Black
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
CMMG Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Armor Black. Whether youre looking to swap your current AR15 upper to quickly switch to 300BLK or looking to top off a new build this 8 BANSHEE upper group is sure to satisfy anyone looking for one of the most compact and stylish 300BLK upper groups made today. Specifications for CMMG Mk4 .300BLK 8in Banshee Upper Group Receiver: Manufacturer: CMMG Caliber: .300 AAC Blackout Barrel Profile: Medium Tapered Barrel Twist Rate: 1-7 Finish: Cerakote Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk4 Magazine Included: No Package Contents: CMMG Mk4 .300BLK 8in Banshee Upper Group Receiver What firearm models does the manufacturer say CMMG Mk4 .300BLK 8in Banshee Upper Group Receiver is compatible with? The manufacturer suggests that CMMG Mk4 .300BLK 8in Banshee Upper Group Receiver is compatible with CMMG Mk4CMMG 30B81F4-AB: Mk4 .300BLK Banshee Upper Group Receiver 8in 1-7 Twist 5/8 X 24 TPI 16.5in Armor Black
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