CMMG Banshee 200 MK57 Upper – 5.7×28, 8″

This CMMG Banshee 200 MK57 upper is centered around an 8-inch 4140 chromoly steel barrel, threaded 1/2”-28 tpi. It’s a good option when you want a shorter overall length without sacrificing quality. The 5.7×28 cartridge offers flat trajectories and manageable recoil, useful for pest control around the homestead or practicing at the range.

CMMG Banshee 200 MK57 Upper Specs:

• Caliber: 5.7x28mm
• Barrel Length: 8 inches
• Barrel Material: 4140 Chromoly
• Thread Pattern: 1/2”-28 tpi
• Receiver Material: 7075-T6 Aluminum
• Handguard: 7” CMMG RML M-LOK
• Muzzle Device: CMMG SV Brake
• Overall Length: 17.30 inches
• Weight: 2.15 pounds
• Twist Rate: 1:9”
• Finish: Black Hard Coat Anodizing (Receiver & Handguard)

The upper receiver is forged from 7075-T6 aluminum, known for its strength and light weight. It comes with a CMMG Mil-Spec charging handle. The 7-inch CMMG RML M-LOK handguard offers plenty of attachment points for lights, optics, or other accessories. The SV brake helps reduce felt recoil and muzzle climb.

Whether you’re building a pistol-caliber carbine for home defense, looking for a compact option for backcountry carry, or simply want to try a different cartridge at the range, the CMMG Banshee 200 MK57 offers a solid foundation. It’s a straightforward upgrade for existing AR-15 lowers.

Shipping & FFL Transfers: Alaska Guns ships firearms to Alaska residents only. All long guns are shipped via FedEx to your local FFL dealer. We handle the FFL transfer paperwork for in-state purchases and shipments. Please allow 3-5 business days for processing and shipping. Contact us with any questions about Alaska firearms laws or the transfer process.