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Machine Gun Kings

Home / CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs
CMMG Banshee 300 Mk57 5.7x28mm AR-15 5" 20 RDs

CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs

$1,386.99

CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs%u200B Features:

Chambered in the fantastic 5.7x28mm FN cartridge, this AR style pistol features a 5″ 4140 steel barrel and an aluminum RML4 M-LOK hand guard. It comes with a CMMG Micro/CQB pistol brace and a 5 position enhanced receiver extension for the ultimate in control and a custom fit. This is a great quality AR-15 pistol that will provide you with years of awesome performance. The single stage Mil-Spec trigger is perfect in this platform and the radial delayed blowback action handles the 5.7x28mm cartridge flawlessly. The 5.7 cartridge is a versatile choice offering suppressed fire, a fun day at the range and its ideal for home defense. Whether you like plinking for recreational shooting, need a great gun for varmint and pest control, or a compact gun to protect your home and family, the Mk57 Banshee 300 from CMMG is the only gun you’ll need!

CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs%u200B Specifications :
 

  • CMMG Inc. Banshee 300 Mk57 57A1843-MB
  • AR15 Semi Automatic Pistol
  • Radial Delayed Blowback
  • 5.7 FN, 5.7x28mm
  • 20 Rounds
  • 5″ 4140 Steel Medium Taper Barrel with a 1:9 Twist
  • Threaded Muzzle 1/2×28 TPI with Thread Protector
  • 7075-T6 Aluminum Receivers
  • CMMG Oversized Ambidextrous Charging Handle
  • CMMG Ambidextrous Safety Selector
  • Single Stage Mil-Spec Trigger
  • CMMG RML4 M-LOK Handguard
  • Full Length Picatinny Top Rail
  • Magpul MOE Pistol Grip
  • CMMG Micro/CQB RipBrace Pistol Brace
  • 5 Position Enhanced Receiver Extension
  • Receiver End Plate with Ambidextrous Sling Loops
  • Midnight Bronze Cerakote Finish
  • Length 19.2″
  • Weight 4 lbs 7 oz
  • Made In The USA

In Stock – Ships 3-4 Days

SKU: f21262ee08fe Category: Tags: , , , , , ,

Description

CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs — $1386.99

In Stock & Ready to Ship to your New Mexico FFL dealer.

Key Features

  • ✅ Various Quality — Factory precision and proven reliability
  • ✅ New Mexico Legal — Compliant with all NM state regulations
  • ✅ In Stock & Ships Fast — 3–5 business days to your NM FFL
  • ✅ Authorized Dealer — Full manufacturer warranty included
  • ✅ Expert Support — Real NM firearms experts
  • ✅ New Customer Discount — 20% off first order with code WELCOME20

    • – ✅ **NM Permitless Carry Ready** — No permit needed in New Mexico since 2021
    – ✅ **Concealed Carry Optimized** — Compact, reliable, all-day comfortable

Technical Specifications

Specification Detail
Manufacturer Various
Model CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs
Action Semi-Auto / Striker-Fired
Compliance New Mexico Legal
Warranty Full Manufacturer Warranty

Why Buy from Machine Gun Kings?

New Mexico’s trusted source for AR components, tactical platforms, and firearms. 15+ years serving NM gun owners. Licensed FFL dealer. Shipping daily to: Lovington, Artesia, Espanola, Las Cruces, Cloudcroft, Clovis, Socorro, Silver City.

New Mexico Gun Law Quick Facts

  • ✅ Permitless Carry — Constitutional carry since 2021
  • ✅ No Waiting Period — Take delivery same day (after NICS)
  • ✅ No Magazine Limits — Zero capacity restrictions
  • ✅ Castle Doctrine — Strong home defense protections

Frequently Asked Questions

Do I need a permit to carry this pistol in New Mexico?

No. New Mexico passed constitutional carry in 2021. Any law-abiding resident 19+ can carry concealed without a permit.

What’s the best holster for this pistol in NM?

We carry Kydex IWB and OWB holsters for most pistols. Contact us for recommendations matched to your carry style.

Does the CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs come with a warranty?

Yes. As an authorized Various dealer, Machine Gun Kings ensures every CMMG Banshee 300 Mk57 5.7x28mm AR-15 5″ 20 RDs includes the full manufacturer warranty.

Can I use the WELCOME20 coupon?

Yes! New customers get 20% off their first order at Machine Gun Kings. Use code WELCOME20 at checkout.

How long does shipping take to New Mexico?

Most orders reach your FFL within 3–5 business days. We ship Monday–Friday from our New Mexico warehouse.

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