CMMG Banshee FourSix 4.6x30mm Review

CMMG Banshee FourSix 4.6x30mm AR Pistol

The CMMG Banshee 4.6x30mm is fairly new to the scene but already made a good impression within the shooting community. Find out what the fuss is about in our CMMG Banshee 4.6x30mm gun review below!


Ballistically, it performs similarly to the 17 HMR so it’s not that hard-hitting, but its size and low recoil make it really fun to shoot. Plus its penetrating power ranges out to 150 yards, so you can stack rounds at that distance.


Light recoil

Compact and easily concealable

Comes with a lifetime quality guarantee

Comes with a standard Cerakote finish

40-round mag capacity


Average ballistics

Limited ammo availability

What Customers Say

For the $1400 price tag, I would have thought that the trigger would have been a little Smoother and Cleaner of a break, but all in all, we are Very Happy with this Fun little Tool. I only wish that ammo was more readily available locally, and a little lower priced. I give this a Five star even with the gritty trigger, because….well…. it’s an Awesome gun. Update: I’ve Polished the trigger group and added a Smith Vortex muzzle break. 100% Fun.


Exactly what I didn’t know I needed! It’s just fun to shoot. I just need to get someone local to sell ammo for it. .

Jeremy B

Better for Personal Defense: CMMG Banshee MK4 5.7X28MM AR-15 Pistol

The CMMG Banshee MK4 5.7X28MM AR-15 Pistol features a Radial Delayed Blowback™ Operating System that offers lighter recoil impulse and less bolt weight compared to other blowback systems.

This AR pistol also has a 40-rounds capacity. It comes in a nice and compact setup (only 19 inches overall length) – with a 5-inch barrel, single-stage trigger, micro rip brace, aluminum construction, and Cerakote finish.


Very accurate

Ambidextrous safety

40-rounds capacity


Softer recoil impulse




What Customers Say

“The accuracy is indisputable. I love these 40-round mags. It also has an oversized charger that handles just so easy to grip, and of course the rip brace is super cool.”

The FirearmGuy

The barrel itself is made out of 4140 CMD steel. It’s got a nitride finish. Inside it’s gonna give you a good barrel life, good surface hardness, good corrosion resistance, and all in all, relatively easy to clean as well.”


Cheaper to Shoot: Daniel Defense DDM4

Daniel Defense produces some of the best ARs in the industry, and one is the DDM4. It’s manufactured using premium materials and all of its parts are built by Daniel Defense in-house so expect top quality and performance.

This rifle is equipped with a cold hammer-forged barrel that offers excellent accuracy, durability, and reliability. Plus a flared magazine well for quick and reliable reloading.


Ambidextrous safety selector

Non-slip grip

Non-slip cheek weld



Capacity is only 30 rounds

What Customers Say

The DD is outstanding, fit and finish was everything I have ever heard about DD. This rifle feels a lot lighter than it looks. The trigger was the only thing I upgraded, it was just a standard mil-spec trigger. I think I will have to buy another one soon.


CMMG Banshee FourSix Specifications

  • 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: Mil-Spec Single Stage
  • Trigger Guard:CMMG Zeroed Trigger Guard
  • Safety Selector: CMMG Zeroed 60/90 Degree
  • Magazine: CMMG 40 rounds
  • Weight: 4.3 lbs
  • Length: 23.7″

First Impressions: CMMG Banshee 4.6x30mm

You can tell that CMMG spent a lot of time and effort on this AR pistol, particularly on its bolt carrier group. Shooting it feels like shooting .223 but with tamer recoil, so it is a breeze to hold on target for quick follow-up shots. 

CMMG Banshee 4.6x30mm Features

Rip Brace

The rip brace is a nice feature that comes with most Banshee AR pistols. It allows you to keep the FourSix in the shortest form or rip it out for more comfortable shooting.

Standard AR15-sized Magwell

The FourSix comes with a 40-round magazine and a standard AR15-sized Magwell that’s compatible with most standard lowers so you can use the FourSix upper with any lower.

FourSix™ Gas Block

This gas block helps with heat dissipation, so even if you run the FourSix™ pretty hard, you won’t encounter any problems. 


The FourSix ran flawlessly and we enjoyed shooting it during our range time. It has great penetrating power but is compact, lightweight, and has low recoil.

FeaturesThe FourSix has incredible ergonomics and controls.4.5
ReliabilityIt has great penetrating power at 150 yards. It also fires, extracts, and new magazine feeds smoothly after 300 rounds.4.5
Build & FinishSleek durable construction and great long-lasting sniper gray finish.5
AccuracyVery accurate and you can stack rounds on top of each other.4.5
ValueAt $1400, you get what you pay for. 4.5
OverallDespite its price, the FourSix delivers top-notch performance, so it’s worth every penny. Plus it comes with a lifetime quality guarantee, what more can you ask for?4.8
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