MPN: 57B88BD-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: 8" 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: ~2.9 lbs.
• Length: ~16.5"

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

Details:

The CMMG Banshee 5.7x28mm Upper Group offers smooth shooting with low recoil, perfect for users seeking faster target re-acquisition. This chambering provides excellent ballistics, making it ideal for both competitive shooters and personal defense.

Radial Delayed Blowback for Better Control

Designed with a radial delayed blowback system, this CMMG 5.7x28mm upper reduces felt recoil while maintaining lightweight handling. The bolt carrier group is optimized to improve cycling, giving you enhanced performance compared to traditional blowback systems.

Versatile Fit for AR Platforms

This 5.7mm AR upper group is compatible with CMMG Mk57 lowers and standard AR-15 lowers when using conversion magazines, providing flexibility for various builds. The 8” barrel strikes the perfect balance between portability and accuracy, making it suitable for multiple shooting scenarios.

Premium Components and Finish

Featuring a ZEROED™ linear compensator and an ambidextrous charging handle, this upper group delivers comfort and precision. Constructed from 6061-T6 billet aluminum, it offers durability with a selection of Cerakote finishes, allowing you to customize your setup.

Ready for Your Next Upgrade

Whether you’re building a new rifle or enhancing an existing one, the Banshee 5.7x28mm upper provides reliable, top-tier performance. Elevate your shooting experience with smooth handling, quick adaptability, and the rugged design that CMMG is known for.