| 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 Compensator |
| Muzzle Thread | 1/2 x 28 |
| Gas Port Location | Micro |
| Gas Block | FourSix Specific .750 |
| Upper Receiver | Billet 6061 T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075 T6 Aluminum |
| Hand Guard | CMMG EML7 M-LOK |
| Finish | Cerakote |
| Charging Handle | CMMG ZEROED Ambi |
| Pistol Grip | CMMG ZEROED Pistol Grip |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6 Position Fastback w/Ambi Sling Plate |
| Stock / Brace | CMMG RipStock |
| Trigger Type | ZEROED Drop-In |
| Trigger Guard | CMMG ZEROED Trigger Guard |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Magazine | CMMG 40rd |
| Weight | 5.4 lbs |
| Length | 24" |
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.
SBR, BANSHEE, Mk4, 4.6x30mm, 8"
Released in 1999, 4.6x30mm was designed as a relatively small and lightweight cartridge with minimal felt recoil meant to compete with 5.7x28mm. Ballistically 4.6x30 and 5.7x28 are similar in the sense that both are high velocity, flat shooting projectiles that offer great penetration.
Enter the BANSHEE™ FourSix SBR, presenting an impressive 40-round magazine capacity, light recoil, and great penetration at close distances, the FourSix here to reimagine the personal defense weapon. Not only was FourSix the first AR chambered in 4.6x30mm, it is also the first 4.6x30mm firearm ever release to the U.S. civilian market!
Available in a variety of cerakote finish options, the BANSHEE series represents the most innovative AR SBRs available today. From the quick deploying RIPSTOCK®, 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.
**All NFA rules apply** All BANSHEE NFA SBRs (short barrel rifles) require additional ATF paperwork & processing. See linked CMMG Resource article for more information.
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 RIPSTOCK to the full kit of ZEROED parts and accessories are 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:
ZEROED AR15 Ambi Charging Handle
ZEROED Extended Mag Release Button
ZEROED AR15 Polymer Dust Cover
ZEROED Linear Compensator 5.56mm
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.