| Platform | Mk4 |
| Caliber | 4.6x30mm |
| Operating System | Direct Impingement |
| Barrel Length | 8 |
| Barrel Twist | 1:5.9 |
| Barrel Contour | MT |
| Barrel Material | 4140CM, SBN |
| Barrel Twist | 1:5.9 |
| Muzzle Device | CMMG ZEROED Linear Comp |
| Muzzle Thread | 1/2 X 28 |
| Gas Port Location | Micro |
| Gas Block | FOURSIXTM Specific .750 |
| Upper Receiver | Billet 6061 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Hand Guard | CMMG EML7 M-LOK |
| Finish | Cerakote Standard |
| Charging Handle | CMMG ZEROED Ambi |
| Pistol Grip | CMMG ZEROED Pistol Grip |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6 Position Fastback Extension |
| Stock / Brace | CMMG RipBrace |
| Trigger Type | ZEROED Drop-In Single Stage |
| Trigger Guard | CMMG ZEROED Trigger Guard |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Magazine | CMMG 40rd |
| Weight | 4.3 lbs |
| Length | 23.7" |
Please Allow 15-30 Days To Process Your Order.
State/local restrictions may apply in CA, CO, CT, DE, DC, HI, IL, MD, MA, MI, NJ, NY, or WA. Customers must review our Firearms Shipping Policy prior to ordering.
Firearms with attached pistol brace. Please confirm your FFL is accepting transfers for pistol brace equipped firearms prior to ordering.
PISTOL, BANSHEE, Mk4, 4.6X30MM, 8"
With an impressive 40-round magazine capacity, light recoil, and great penetration at close distances, the CMMG® FourSix™ is here to reimagine the Personal Defense Weapon. Not only is the FourSix the first AR chambered in 4.6x30mm, but it is also the first 4.6x30mm firearm ever released to the U.S. civilian market!
What is 4.6x30mm?
First introduced in 1999, the 4.6x30mm is known for its pairing with the Heckler & Koch MP7. By design, the 4.6x30mm is a relatively small and lightweight cartridge with minimal felt recoil meant to compete with the 5.7x28mm.
Ballistically the 4.6x30mm round is very similar to the 5.7x28mm round in the sense that it is a high velocity, flat-shooting projectile that has great penetration, but where the 4.6x30mm will hold an advantage is in your pocketbook. Due to the difficult barrier of entry for ammo manufacturers, the 5.7x28mm round currently and will always cost more than the more affordable and easier to manufacture 4.6x30mm round.
Available in a variety of Cerakote finish options, the BANSHEE series represents the most innovative AR pistols and SBRs available today. From the quick deploying RIPBRACE® to the stylized receivers and EML™ handguards, every BANSHEE is tailor-made to be the personal defense weapon you can always depend on. With full-length M-LOK® slots on both sides and the bottom of the handguard as well as M-LOK between the top Picatinny rail sections, you’ll always have enough space for those must-have accessories.
Mk4 ZEROED parts and accessories – Quality comes standard
The AR15 platform is well known for its capability for customization but picking the right parts doesn’t have to be a nightmare of homework. Everything from the RIPBRACE to the full kit of ZEROED parts and accessories is made here in the USA with quality and attention to detail that is second to none and each BANSHEE comes equipped with a slew of ZEROED parts standard, including:
Lifetime Quality Guarantee
We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.
~Firearms shipping to states with magazine capacity restrictions will only ship with 10rd magazines in place of standard capacity magazines. CMMG does not address any other state compliancy requirements for further restricted states.