Kansas Gunshop is a Wichita, KS-based retailer specializing in firearms and accessories. The CMMG Banshee 200 Mk57 5.7x28mm AR Pistol with 8-inch barrel and stabilizing brace is a compact, high-performance firearm designed for versatility and reliability. Its unique radial delayed blowback system sets it apart from traditional AR platforms. Available now for $899.00 with same-day shipping from our Kansas facility.
Reviewed by Derek, Owner & FFL Holder at Kansas Gunshop. Kansas-licensed FFL dealer since 2008, NRA Range Safety Officer.
Last updated: April 2026
Specifications
| Product Type | AR Pistol |
|---|---|
| Caliber | 5.7x28mm |
| Barrel Length | 8 inches |
| Overall Length | 22.5 inches (collapsed) |
| Weight | 5.2 lbs |
| Material | 7075-T6 Aluminum receiver, steel barrel |
| Finish | Type III hardcoat anodized |
| Action | Radial delayed blowback |
| Magazine Capacity | 20 rounds (included) |
| Stock/Brace | SB Tactical stabilizing brace |
| Country of Origin | USA |
| Condition | New |
Key Features
- Radial delayed blowback system reduces recoil and muzzle rise
- 8″ chrome-lined barrel optimized for 5.7x28mm ballistics
- SB Tactical stabilizing brace for improved control
- Ambidextrous controls including safety selector and magazine release
- M-LOK compatible handguard for accessory mounting
- Includes one 20-round CMMG magazine
Who This Pistol Is For
Buy it if:
- You want a compact defensive firearm with rifle ballistics
- You appreciate the low recoil of the 5.7x28mm cartridge
- You need a versatile platform for home defense or range use
- You value CMMG’s quality and innovative engineering
Skip it if:
- You prefer traditional pistol calibers (consider our handgun selection)
- You need a full-size rifle for long-range shooting
- Budget is your primary concern (though this is competitively priced for its class)
Pros & Cons
Pros:
- ✅ Exceptionally flat-shooting for its size
- ✅ High-quality CMMG construction
- ✅ Includes stabilizing brace out of the box
- ✅ Ambidextrous controls for left-handed shooters
- ✅ Compatible with common AR-15 triggers and grips
Cons:
- ❌ 5.7x28mm ammunition can be expensive compared to 9mm
- ❌ Limited aftermarket support compared to standard AR-15 platforms
How It Compares
| Feature | CMMG Banshee 200 Mk57 | PSA 5.7 Rock | Ruger-57 Pistol |
|---|---|---|---|
| Action Type | Radial delayed blowback | Blowback | Blowback |
| Barrel Length | 8″ | 5″ | 4.94″ |
| Platform | AR-style | Pistol | Pistol |
| Magazine Capacity | 20 rounds | 23 rounds | 20 rounds |
| MSRP | $1,299 | $799 | $899 |
| Our Price | $899 | $699 | $799 |
Frequently Asked Questions
Is the CMMG Banshee 200 Mk57 California compliant?
No, this configuration is not California compliant due to its pistol brace and other features. Contact us for compliant alternatives.
Does this come with iron sights?
No, the Banshee ships without sights to allow you to choose your preferred optic or iron sight setup.
What’s the effective range of this pistol?
The 5.7x28mm cartridge remains effective to about 200 yards, though the 8″ barrel reduces velocity slightly compared to full-length barrels.
Can I shoulder the stabilizing brace?
Current ATF regulations allow shouldering of pistol braces. However, regulations may change – we recommend checking the latest ATF guidance.
Where can I buy CMMG firearms online?
Kansas Gunshop (kansas-gunshop.com) is an authorized CMMG dealer with competitive pricing and fast shipping from Wichita, KS.
What’s included in the box?
The pistol comes with one 20-round magazine, SB Tactical brace, and all necessary paperwork.
Do you offer layaway?
Yes, we offer 90-day layaway plans with 20% down. Contact us to set up a layaway agreement.
✅ Same-day shipping from Wichita, KS
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: AR-15 Rifles | Full Shop
As a Kansas-licensed FFL dealer since 2008, I’ve handled hundreds of AR-platform firearms. The CMMG Banshee series stands out for its innovative engineering and reliable performance. This review is based on hands-on experience with this model and customer feedback.
Last updated: April 2026
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