The CMMG Banshee MK4 4.6x30mm 8" pistol is a purpose-built AR platform personal defense weapon that brings an exciting and underutilized cartridge to the US civilian market. Chambered in 4.6x30mm—the same round paired with the legendary Heckler & Koch MP7—this compact, lightweight AR pistol delivers light recoil, high velocity, and serious penetration without the extreme cost of 5.7x28mm ammo. At just 3.9 lbs and 23.7" overall length, the Banshee MK4 is nimble enough for vehicle, property, or close-quarters defense scenarios while remaining controllable and quick to transition between targets.

What sets the Banshee MK4 apart is its thoughtful engineering for the cartridge and platform. The 8" barrel is optimized with a 1:5.9 twist and paired with CMMG's own FourSix-specific gas block and micro gas port to cycle 4.6x30mm reliably. The billet upper and forged lower receivers are aluminum (6061 T6 and 7075 T6 respectively), while the EML7 M-LOK handguard offers genuine modularity—full-length slots on both sides and bottom, plus M-LOK sections between top Picatinny rails—so you can mount lights, lasers, or other accessories exactly where you need them. The ZEROED ambi charging handle, drop-in trigger, and 60/90-degree safety selector keep controls accessible whether you're right- or left-handed.

The Banshee MK4 ships with a 40-round magazine, so you've got serious magazine-fed capacity for a defensive pistol. The ZEROED linear compensator on the 1/2x28 threads helps manage what little recoil the 4.6x30mm generates. Built in Extended Armor Black Cerakote, it's a modern, functional design that doesn't shout for attention—it just works. Whether you're exploring the 4.6x30mm platform, looking for a tack-driving, low-recoil carbine pistol, or building a specialized home-defense or vehicle gun, the Banshee MK4 is a solid, well-executed choice.

The CMMG Banshee MK4 4.6x30mm 8" pistol is a purpose-built AR platform personal defense weapon that brings an exciting and underutilized cartridge to the US civilian market. Chambered in 4.6x30mm—the same round paired with the legendary Heckler & Koch MP7—this compact, lightweight AR pistol delivers light recoil, high velocity, and serious penetration without the extreme cost of 5.7x28mm ammo. At just 3.9 lbs and 23.7" overall length, the Banshee MK4 is nimble enough for vehicle, property, or close-quarters defense scenarios while remaining controllable and quick to transition between targets.

What sets the Banshee MK4 apart is its thoughtful engineering for the cartridge and platform. The 8" barrel is optimized with a 1:5.9 twist and paired with CMMG's own FourSix-specific gas block and micro gas port to cycle 4.6x30mm reliably. The billet upper and forged lower receivers are aluminum (6061 T6 and 7075 T6 respectively), while the EML7 M-LOK handguard offers genuine modularity—full-length slots on both sides and bottom, plus M-LOK sections between top Picatinny rails—so you can mount lights, lasers, or other accessories exactly where you need them. The ZEROED ambi charging handle, drop-in trigger, and 60/90-degree safety selector keep controls accessible whether you're right- or left-handed.

The Banshee MK4 ships with a 40-round magazine, so you've got serious magazine-fed capacity for a defensive pistol. The ZEROED linear compensator on the 1/2x28 threads helps manage what little recoil the 4.6x30mm generates. Built in Extended Armor Black Cerakote, it's a modern, functional design that doesn't shout for attention—it just works. Whether you're exploring the 4.6x30mm platform, looking for a tack-driving, low-recoil carbine pistol, or building a specialized home-defense or vehicle gun, the Banshee MK4 is a solid, well-executed choice.