Mk4 Banshee Upper Receiver Group, 5.56 NATO, 12.5", Armor Black
$819.99 at OpticsPlanet
In stock Sale
CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten
No ratings yetBest price
$789.99at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Mk4 Banshee Upper Receiver Group, 5.56 NATO, 12.5", Armor Black $819.99at OpticsPlanet
- CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Ar… $849.99at MidwayUSA
- Midwest Industries Combat Rail HD .223 Wylde 10.5inch Upper Rec… $789.95at 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.
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In stock
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 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten is a 12.5" 5.56 / .223 upper receiver from CMMG. One store lists it, OpticsPlanet at $789.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 12.5" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Tungsten
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
CMMG Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten. 5 5.56mm BANSHEE upper group with the Mk4/standard AR15 lower group of your choice to create a compact AR pistol or SBR that blends maneuverability with carbine like ballistic performance. Specifications for CMMG Mk4 5.56X45mm NATO 12.5in Banshee Upper Group Receiver: Manufacturer: CMMG Caliber: 5.56x45mm NATO Overall Length: 20.8 in Barrel Length: 12.5 in Barrel Profile: Medium Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Muzzle Device: CMMG Zeroed Linear Compensator Fabric/Material: 6061-T6 Aluminum Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Make: CMMG Gun Model: CMMG Mk4 Weight: 3.8 lb Magazine Included: No Mount Type: M-LOK Package Contents: CMMG Mk4 5.56X45mm NATO 12.5in Banshee Upper Group Receiver What firearm models does the manufacturer say CMMG Mk4 5.56X45mm NATO 12.5in Banshee Upper Group Receiver is compatible with? The manufacturer says that CMMG Mk4 5.56X45mm NATO 12.5in Banshee Upper Group Receiver is compatible with CMMG Mk4CMMG 55BDFF4-TNG: Mk4 5.56X45mm NATO Banshee Upper Group Receiver 12.5in Tungsten
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