MPN: 57BBCF0-AB

Features:

• Radial Delayed Blowback System - softer recoil impulse and reduced bolt weight
• Caliber: 5.7x28mm
• Finish: Armor Black Cerakote
• Upper Receiver: CMMG Mk4 Upper Receiver - 6061-T6 Aluminum
• Handguard: 4-Inch CMMG EML4 M-LOK Handguard
• Muzzle Device: CMMG ZEROED Linear Compensator
• Barrel: 5" 1:9 Salt Bath Nitrided 4140 Chrome Moly Steel
• Muzzle Thread Pattern: 1/2-28
• Bolt Carrier Group: CMMG Mk57 5.7x28mm Bolt Carrier Group
• Charging Handle: CMMG ZEROED AR15 Ambi Charging Handle
• HP and MPI Tested

*This upper receiver assembly has a barrel that is shorter than 16". This upper is only for use on AR pistol lower receivers and NFA registered Short-Barreled Rifle (SBR) lower receivers. All NFA laws apply!

Specifications:

• Weight: ~2.5 lbs.
• Length: ~13.8"

Compatibility:

• CMMG Mk57 lower receivers
• CMMG Mk4 or standard AR-15 lower receivers (when used with 5.7 AR Conversion Mags)
• FN®* Five-seveN®* pattern magazines

Includes:

• 1x CMMG Banshee 5.7x28mm 5" Complete Upper
• 1x CMMG Mk57 5.7x28mm Bolt Carrier Group
• 1x CMMG ZEROED AR15 Ambi Charging Handle

Details:

The CMMG Banshee 5.7x28mm 5" Upper Group combines smooth handling and low recoil for quick, accurate shots. With its 5” barrel, this upper is perfect for shooters seeking a compact solution that excels in both maneuverability and precision, whether for personal defense or range use.

Radial Delayed Blowback for Superior Control

CMMG’s radial delayed blowback system softens recoil and enhances cycling, keeping you in control during rapid fire. Paired with an ambidextrous charging handle and linear compensator, it offers comfort and ease of operation under any conditions.

Your Performance Upgrade Awaits

Built from 6061-T6 aluminum and available in multiple Cerakote finishes, the Banshee 5" upper ensures long-lasting reliability and customization. Equip your AR today and experience the smooth performance and accuracy this upgrade delivers—every shot will remind you why this is the right choice for your build.