Turn Any AR-15 Into A 5.7x28 PDW (CMMG Mk57 Banshee Upper)

Published on May 24, 2020
Duration: 12:42

This review showcases the CMMG Mk57 Banshee 300 complete upper receiver kit, enabling an AR-15 platform to fire the 5.7x28mm cartridge. The kit offers a high-velocity, low-recoil shooting experience with 40-round magazines. It features a 5-inch barrel, M-LOK handguard, and last-round bolt hold-open, demonstrating versatility by pairing with various lower receivers, including those with binary triggers.

Quick Summary

The CMMG Mk57 Banshee 300 upper receiver kit converts an AR-15 lower to fire 5.7x28mm rounds, offering high velocity and low recoil. It features a 5-inch barrel, 40-round magazines, and last-round bolt hold-open.

Chapters

  1. 00:12Intro: CMMG Mk57 Banshee Upper
  2. 00:315.7x28mm Performance & Benefits
  3. 01:19Magazine Capacity & Kit Contents
  4. 02:05Upper Receiver Features
  5. 03:16Testing with Fostech Echo Trigger
  6. 07:20Technical Specifications Summary
  7. 08:52Caliber Comparison & Giveaway

Frequently Asked Questions

What is the CMMG Mk57 Banshee 300 upper receiver kit?

The CMMG Mk57 Banshee 300 is a complete upper receiver kit that allows a standard AR-15 lower receiver to fire the 5.7x28mm cartridge, effectively converting it into a Personal Defense Weapon (PDW).

What are the benefits of the 5.7x28mm caliber?

The 5.7x28mm round offers high velocity and significantly lower recoil compared to calibers like 5.56 NATO, making it easier to control for rapid follow-up shots and suitable for compact firearms.

What are the key features of the CMMG Mk57 Banshee upper?

It includes a 5-inch threaded barrel with a 1:9 twist rate, 1/2x28 thread pitch, 7075 aluminum construction, an M-LOK handguard, a Picatinny top rail, and a last-round bolt hold-open capability.

Does the CMMG Mk57 Banshee kit come with magazines?

Yes, the kit typically includes three 40-round CMMG magazines specifically designed for the 5.7x28mm cartridge and to fit standard AR-15 mag wells.

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