Description

The CMMG Banshee Mk4 SBR occupies the short-barreled rifle segment of CMMG’s Banshee line, delivering a compact 5.56 NATO package on the Mk4 platform. The Mk4 designation refers to CMMG’s AR-15-pattern upper and lower receiver architecture, which maintains compatibility with the broad ecosystem of Mk4/AR-15-pattern components, magazines, and accessories. At 12.5″ of barrel length, the Banshee Mk4 reduces overall footprint compared to carbine-length configurations while retaining the 5.56 NATO chambering for use with standard STANAG-pattern magazines, including the Magpul PMAG 30 AR/M4 GEN M3.

This variant is finished in Tungsten, a muted gray tone applied to the receiver. As an NFA-regulated short-barreled rifle, the Banshee Mk4 SBR requires a completed ATF Form 4 transfer through a licensed Class III/SOT dealer and is subject to the $200 NFA tax stamp process. The Tungsten finish is specific to this SKU (55A6B0A-TNG) and is distinct from other color variants offered in the Banshee Mk4 5.56 NATO 12.5″ lineup.

Key Features

• Firearm Type: Short-Barreled Rifle (SBR) — NFA regulated
• Action: Semi-Automatic
• Caliber: 5.56 NATO
• Capacity: Not specified
• Barrel Length: 12.5″
• Twist Rate: Not specified
• Overall Length: Not specified
• Weight (Unloaded): Not specified
• Frame / Receiver Material: Not specified
• Barrel Material: Not specified
• Trigger Type: Not specified
• Sights: Not specified
• Optics Mounting: Not specified
• Safety Features: Not specified
• Threaded Barrel: Not specified
• Finish / Color: Tungsten
• Platform: Mk4 (AR-15-pattern)
• Country of Manufacture: Not specified

Use Case

• 12.5″ barrel reduces overall rifle length for confined-space and close-quarters applications compared to standard carbine-length configurations
• Mk4 platform maintains compatibility with AR-15/STANAG-pattern magazines and a wide range of Mk4-compatible components
• 5.56 NATO chambering supports use of both .223 Rem and 5.56 NATO ammunition
• SBR configuration requires NFA registration and ATF Form 4 transfer — suited for shooters already enrolled in the NFA process or with existing approved items
• Tungsten finish is a muted gray coating that reduces visual signature compared to standard black finishes

Compliance & Legal Notes

• FFL Transfer Required: This firearm must ship to a licensed Federal Firearms Licensee (FFL) and will be transferred to the buyer in accordance with federal, state, and local law.
• NFA Item: This product is a Short-Barreled Rifle (SBR) regulated under the National Firearms Act. Transfer requires ATF Form 4 approval and payment of the $200 NFA tax stamp. Processing times vary.
• Shipping Restrictions Apply: Some jurisdictions restrict or prohibit certain firearms or features. Orders may be modified or canceled if delivery is not legally permitted.
• Buyer Responsibility: The buyer is responsible for ensuring this firearm is legal to purchase, possess, and transfer in their jurisdiction.

Box / Package Contains

• One factory-new CMMG Banshee Mk4 SBR — 5.56 NATO, 12.5″ barrel, Tungsten finish
• Manufacturer lock
• Owner’s manual