Mk4 Banshee Upper Receiver Group, 5.56 NATO, 12.5", Armor Black
$819.99 at OpticsPlanet
In stock Sale
CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Midnight Bronze
No ratings yetBest price
$829.99at 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
- Battle Arms Authority Elite 16" Upper 5.56x45mm Free Float M-LO… $824.99at GunMag Warehouse
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $829.99Salechecked 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 Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black
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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 | $829.99 | $829.99 | $829.99 |
Since Oct 14, 2026.
About this part
The CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Midnight Bronze is a 16.1" 5.56 / .223 upper receiver from CMMG. One store lists it, OpticsPlanet at $829.99.
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
- 16.1" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Bronze
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
CMMG Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Midnight Bronze. 5 this is the shortest 5.56mm upper group CMMG offers. Great for anyone looking to build an ultra-compact AR15 thats lightweight and perfectly sized to go anywhere. This 5.56mm BANSHEE upper group is built on our Mk4 AR15 platform. Specifications for CMMG Mk4 5.56X45mm NATO 10.5in Banshee Upper Group Receiver: Manufacturer: CMMG Caliber: 5.56x45mm NATO Barrel Profile: Medium Taper 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 5.56X45mm NATO 10.5in Banshee Upper Group Receiver What firearm models does the manufacturer say CMMG Mk4 5.56X45mm NATO 10.5in Banshee Upper Group Receiver is compatible with? The manufacturer suggests that CMMG Mk4 5.56X45mm NATO 10.5in Banshee Upper Group Receiver is compatible with CMMG Mk4CMMG 55BC7C3-MB: Mk4 5.56X45mm NATO Resolute Upper Group Receiver 16.1in Midnight Bronze
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