Stern Defense MOD5 MLOK 16.1" 45 ACP AR-15 Complete Upper
$593.11 at OpticsPlanet · 3 stores
In stock Sale
CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver 5in 1-16 Twist 0.578x28 TPI .750in Tungsten
No ratings yetBest price
$849.99at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Stern Defense MOD5 MLOK 16.1" 45 ACP AR-15 Complete Upper $593.11at OpticsPlanet
- Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly 8… $550.00at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $849.99Salechecked 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.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly 8in M-LOK Handguard .578-28 TPI 1-16 Twist Rate Black 015SD8INMD5ML6INBR45ACPKK
$550.00 at OpticsPlanet · 2 stores
In stock Sale
Price history
Dashed line = out of stock. Tracking since Oct 14, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $849.99 | $849.99 | $849.99 |
Since Oct 14, 2026.
About this part
The CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver 5in 1-16 Twist 0.578x28 TPI .750in Tungsten is a 5" .45 ACP upper receiver from CMMG. One store lists it, OpticsPlanet at $849.99.
Fits and works with
- Caliber
- .45 ACP · Shop matching ammo
- Bolt
- .45 ACP · Bolt carrier groups
- Muzzle thread
- .578x28 · Muzzle devices
- Barrel length
- 5" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Tungsten
- Platform
- AR-9
- Caliber
- .45 ACP
From the manufacturer
CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver 5in 1-16 Twist 0.578x28 TPI .750in Tungsten. Compact action RDB was an advancement to the original RDB. This (fixed ejector on RDB) is a continued advancement bringing new technologies to the original platform. Chambered in one of the most iconic calibers with over a century of faithful use the 5 BANSHEE MkG upper group in 45 ACP is the shortest MkG upper CMMG offers. Ready to pair out of the box with an existing or new MkG lower group this upper is the piece you need to build the ultimate fun-sized AR pistol or SBR. Specifications for CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver: Manufacturer: CMMG Caliber: .45 ACP Barrel Twist Rate: 1-16 Firearms Threads Per Inch: .578x28 Muzzle Device: CMMG Zeroed Muzzle Brake Finish: Cerakote Fabric/Material: Aluminum Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Barrel Material: 4140 Chrome Moly Vanadium Magazine Included: No Package Contents: CMMG MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver CMMG 45B570F-TNG: MkG .45 ACP Banshee Fixed Ejection Upper Group Receiver 5in 1-16 Twist 0.578x28 TPI .750in Tungsten
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