The CMMG Banshee MK57: Tactical 5.7mm Handgun, 20-Round Capacity is a 5.7x28mm pistol caliber carbines from Cmmg. It is available from 1 vendor at $1615.99.
Name: CMMG Banshee MK57: Tactical 5.7mm Handgun, 20-Round Capacity
Brand: Cmmg
Category: Pistol Caliber Carbines
Caliber: 5.7x28mm
Barrel Length: 8"
Capacity: 20 rounds
UPC: 810148624446
SKU: UCEGJR45W
Recently Added
Concealed CarryBest 9mm HandgunsBest Semi-Auto Shotguns9mm RevolverOptic-ReadyWeatherby Mark VMatch Pistols
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
The CMMG Banshee MK57 is a semi-automatic pistol chambered in 5.7x28mm, built around CMMG's radial delayed blowback operating system. That mechanism keeps felt recoil low for the caliber and contributes to the gun's reputation for reliable cycling across a range of loads.
The upper receiver is billet 6061 T6 aluminum. The ambidextrous charging handle works for left- or right-handed shooters without modification. A CMMG ZEROED linear compensator is included, which directs muzzle blast forward rather than to the sides — useful when shooting in confined bays or next to other shooters.
The 5.7x28mm round is high-velocity and relatively flat-shooting, which appeals to shooters who want those ballistic characteristics in a pistol-format package. The 20-round ProMag gives meaningful capacity without requiring a magazine swap mid-string.
The Banshee MK57 fits tactical shooting sports, range use, and home defense. At 4.8 lbs and 23.7 inches it is not a pocket carry option, but that size allows the 8-inch barrel to extract more velocity from the 5.7mm round than shorter barrels would. Ammunition cost and availability are real factors to consider with this caliber — 5.7x28mm is less common than 9mm and tends to cost more per round.
| Caliber | 5.7x28mm |
| Model | Banshee MK57 |
| Capacity | 20 rounds |
| Magazines included | 0 |
| Barrel length | 8" |
| Weight | 76.8 oz |
| Color | Black |
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.
5.7mm fans tend to be enthusiastic about the Banshee MK57. The compact form factor, low recoil, and 20-round capacity get consistent praise. The Cerakote finish also gets positive mentions for appearance.
The main friction points are ammunition cost and supply. 5.7x28mm is harder to find and more expensive than mainstream pistol calibers, which affects how often some owners actually shoot it. A few users also note the price of the pistol itself is on the high side relative to 9mm alternatives with similar capacity.
Aftermarket support is growing but limited compared to more established platforms. Shooters who want to customize tend to watch forums closely for compatible parts. Overall the reception is positive among those who specifically want 5.7mm — the question most buyers work through is whether the caliber tradeoffs fit their use case.
Price Range: $1615.99 - $1615.99
| Vendor | Price | Condition | Link |
|---|---|---|---|
| Grabagun Com | $1615.99 | New | Buy Now |
5.7x28mm
5.7x28mm
5.7x28mm
5.7x28mm
5.7x28mm
5.7x28mm
10MM AUTO
9mm
.45 ACP
5.7x28mm
9mm
9mm