CMMG BANSHEE® Mk57 — 5.7×28mm, Ultra-Compact, AR Black Finish (ARBLK) | Model 57A9A0FAB | UPC 810144728353
Micro Size, Macro Speed: 5.7×28 in a Fast-Handling BANSHEE
Meet the CMMG BANSHEE® Mk57 in 5.7×28mm—a lightweight, ultra-compact platform that delivers low recoil, flat trajectory, and impressive magazine capacity in a familiar AR-style package. Tuned for the hot 5.7×28 cartridge, this BANSHEE configuration combines a compact “5” series setup (short-barrel class) with a rugged AR Black (ARBLK) finish, a free-float handguard (variant dependent), a Picatinny-top receiver for optics, a minimalist pistol tube, and CMMG ZEROED™ ergonomics for confident control. It’s tailor-made for CQB training, range sessions, light, fast transitions, and suppressor experimentation (where legal).
Caliber: 5.7×28mm • Model: 57A9A0FAB • UPC: 810144728353 • Finish: AR Black (ARBLK)
Why the BANSHEE Mk57 Stands Out
The 5.7×28 Advantage
The 5.7×28mm cartridge offers very light recoil and high velocity, delivering quick sight recovery, flatter flight paths, and rapid follow-up shots. It’s a natural match for compact training and dynamic movement.
Ultra-Compact “5” Series Layout
The BANSHEE “5” configuration emphasizes short overall length and nimble handling in tight spaces. It’s easy to move around vehicles, doorways, barricades, and steel stages—without giving up stability.
Free-Float, Accessory-Ready (Variant Dependent)
A free-float handguard helps protect point of impact from sling/barricade pressure and adds M-LOK® slots for lights, hand stops, and QD sockets, while the top Picatinny rail is ready for your red dot or LPVO.
AR Black (ARBLK) Durability
The low-glare AR Black finish shrugs off sweat, moisture, and heavy range use for a professional look that lasts.
Familiar AR Controls, ZEROED™ Grip
You get the AR-pattern manual of arms you already know, plus CMMG’s ZEROED™ grip with smart texturing and a comfortable angle for consistent, repeatable indexing.
Key Features at a Glance
Caliber: 5.7×28mm (low recoil, high velocity)
Platform: Mk57 BANSHEE® ultra-compact configuration
Controls: AR-pattern safety, mag release, charging handle
Receiver / Rail: Picatinny-top aluminum receiver (optics-ready)
Handguard: Free-float, M-LOK® accessory slots (variant dependent)
Buffer Area: Pistol tube (no brace included)
Ergonomics: CMMG ZEROED™ grip for secure control
Finish: AR Black (ARBLK), low-glare, range-ready
Model / UPC: 57A9A0FAB / 810144728353
Exact barrel length, muzzle treatment/threading, handguard length, and small components can vary by production run and jurisdiction. Always confirm your serialized spec card/product label.
What You’ll Notice on the Range
Flat, Fast, and Forgiving
With the soft impulse of 5.7×28mm, the Mk57 stays on target through quick strings, making it ideal for new shooters, compact CQB drills, and high-volume practice.
Free-Float Consistency
A free-float handguard supports repeatable accuracy by isolating the barrel from sling tension and barricade pressure—useful when you lean hard into positional shooting.
Compact Control
The short front end and pistol-tube rear keep weight centered for quick transitions and stable snapshots, whether you’re running a micro red dot or low-power variable optic.
Ideal Use Cases
Home & Property Practice: Low recoil and fast sight recovery in a compact package
Training & CQB Drills: AR controls plus high-velocity 5.7×28 for smooth, rapid reps
Range Fun & Steel: Minimal muzzle rise and easy tracking on small targets
Suppressor Exploration (where legal): 5.7×28 excels with tuned loads and proper mounts
Smart Setup Recommendations
Optics: A micro red dot for speed; an LPVO (1–4×/1–6×) for small target work
White Light: Compact M-LOK® weapon light with momentary switch placement
Sling: Modern 2-point sling with QD swivels for retention and positional support
Magazines/Ammo: Use quality 5.7×28 magazines and test a few loads to confirm cycling and zero
Suppressor: If threading is included on your unit, verify thread pitch and mount compatibility (follow all laws)
Technical Specifications (General — Verify Your Spec Card)
Caliber: 5.7×28mm
Action: Semi-automatic, AR-pattern controls
Barrel / Muzzle: Compact “5” class configuration; threading/muzzle device varies by SKU
Handguard: Free-float, M-LOK® compatible (length varies by build)
Upper/Lower: Aluminum, optics-ready Picatinny top
Finish: AR Black (ARBLK)
Buffer Area: Pistol tube (no brace included)
Model Number: 57A9A0FAB
UPC: 810144728353
Barrel length, thread pitch, gas/operating system, furniture, and included accessories may differ by batch and local compliance packages. Always defer to your product label.
Frequently Asked Questions
Q: What magazines does the Mk57 use?
A: Use quality 5.7×28 magazines recommended for the Mk57 configuration. Test with your preferred loads to confirm reliability.
Q: Is the barrel threaded from the factory?
A: Many BANSHEE models are threaded; threading varies by SKU. Check your serialized spec card before buying mounts or suppressors.
Q: Can I mount a brace or stock?
A: This model lists a pistol tube. Adding a brace/stock is subject to current laws and regulations; verify compliance in your jurisdiction.
Q: What ammo works best?
A: The Mk57 typically runs well with quality factory 5.7×28. Try a few brands/weights and zero with your duty/training load.
SEO-Rich Highlights & Buyer Keywords
CMMG BANSHEE Mk57 5.7×28 ultra-compact AR pattern
AR Black (ARBLK) finish, optics-ready Picatinny rail, free-float M-LOK handguard
Pistol tube, CMMG ZEROED grip, low recoil, fast follow-ups
Model 57A9A0FAB, UPC 810144728353
5.7×28 training carbine/pistol for CQB drills, range, and suppressor exploration (where legal)
Meta Title (SEO)
CMMG BANSHEE Mk57 — 5.7×28 Ultra-Compact, AR Black, Free-Float M-LOK, Optics-Ready | 57A9A0FAB
Meta Description (SEO)
Go light, fast, and flat with the CMMG BANSHEE Mk57 in 5.7×28. Ultra-compact “5” configuration, AR Black finish, optics-ready Picatinny rail, free-float M-LOK handguard, pistol tube, and ZEROED grip. Model 57A9A0FAB, UPC 810144728353.
Structured Data (Product Schema JSON-LD)
Responsible Use Reminder
Follow all local, state, and federal laws regarding firearm ownership, transport, suppressor use, and magazine capacity. Confirm your unit’s thread pitch and component specs on the product label, function-test with your chosen ammunition, and practice safe handling and secure storage.
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