Cmmg Banshee Mk3 308Win 12.5 Armor Black

The CMMG Banshee Mk3 308Win 12.5 Armor Black is a short-barrel .308 Winchester pistol built on CMMG's proven Mk3 platform—the AR-10 sized foundation that brings modern rifle modularity to a full-power rifle caliber in a compact, maneuverable package. If you've shot AR-15s and want the ballistic punch of .308 Win in a shorter form factor for hunting, home defense, or specialized shooting applications, the Banshee Mk3 delivers genuine stopping power without the length of a traditional rifle.

CMMG engineered this pistol around the LR-308/DPMS Gen 1 high-pattern design, meaning you get the ergonomic familiarity and parts compatibility that serious shooters expect. The 12.5-inch 4140CM chrome-moly barrel with a 1:10 twist is paired with a CMMG ZEROED linear compensator (5/8x24 threading) and mid-port gas system to manage recoil and keep the gun under control. Billet 7075-T6 aluminum receivers, an ambi charging handle, and a smooth single-stage trigger from CMMG's ZEROED line round out a purpose-built platform that respects your experience with modern tactical rifles.

Wrapped in Cerakote Standard finish, topped with an 11-inch CMMG EML11 M-LOK handguard for mounting optics and light, and sporting the CMMG RipBrace and a carbine-length buffer system, this 7.4-pound pistol strikes the balance between portability and shootability. It ships with a 20-round Magpul PMAG and measures 29.5 inches overall—a genuine alternative to full-size .308 rifles when you need something faster through tight spaces without sacrificing caliber or reliability.

Key Features

• Mk3 platform: proven AR-10 architecture for .308 Winchester compatibility and modularity
• 12.5-inch 4140CM barrel with 1:10 twist, optimized for .308 Win ballistics
• Direct impingement gas system with non-adjustable 0.750 gas block for consistent operation
• CMMG ZEROED linear compensator reduces muzzle rise and blast signature
• Ambi charging handle and 60/90-degree safety selector for ambidextrous control
• Billet 7075-T6 aluminum upper and lower receivers for strength and precision
• 11-inch CMMG EML11 M-LOK handguard for mounting lights, lasers, and accessories
• CMMG RipBrace and carbine buffer system for management and control
• ZEROED single-stage drop-in trigger for predictable break
• Integrated trigger guard and pistol grip designed for gloved operation
• Includes one 20-round Magpul PMAG

Specifications

Frequently Asked Questions

Is the CMMG Banshee Mk3 .308 compatible with AR-15 parts and accessories?

No. The Banshee Mk3 is built on the Mk3 platform (AR-10 size) based on the LR-308/DPMS Gen 1 high-pattern design, which is larger than AR-15. It uses full-size .308 Winchester components and is not compatible with standard AR-15 parts. However, it does share modularity within the AR-10/Mk3 ecosystem.

What is included in the box?

The Banshee Mk3 .308 Win 12.5 comes with one 20-round Magpul PMAG magazine. Additional magazines, ammunition, optics, and accessories are sold separately.

Can I use a suppressor on this pistol?

The muzzle is threaded 5/8x24, which is a common suppressor thread pitch for .308 Winchester. Suppressors are legal in most states with the proper federal registration and tax stamp. Always verify local and federal laws before purchasing or installing a suppressor.

What is the purpose of the CMMG ZEROED linear compensator?

The linear compensator directs muzzle blast forward and slightly reduces felt recoil, helping keep the pistol on target during rapid fire. The design is especially useful in short-barrel pistol configurations.