CMMG Banshee 4.6 x 30 with the AS Designs ARC Fire! The MP7 at Home!

Published on October 17, 2025
Duration: 8:13

This video showcases a CMMG Banshee chambered in 4.6x30mm, modified with an AS Designs ARC Fire to emulate an MP7. The build required significant Dremel work and tuning with various buffer weights and spring lengths to achieve reliability. While expensive to shoot, it's presented as a fun, impractical range toy. The reviewer compares its recoil to 5.56 and tests several suppressors.

Quick Summary

The CMMG Banshee 4.6x30mm, modified with an AS Designs ARC Fire, aims to replicate the HK MP7 experience. This build requires extensive Dremel work and tuning of buffer components for reliability, resulting in a fun but impractical and expensive range toy with soft recoil comparable to a 5.56 AR-15.

Chapters

  1. 00:40MP7 at Home Build Concept
  2. 01:03CMMG Banshee 4.6x30mm Overview
  3. 01:15Modification and Tuning Required
  4. 01:44Impractical Range Toy
  5. 01:56Recoil Control Test
  6. 02:24Comparison to 5.56
  7. 03:01Understanding 4.6x30mm Ammunition
  8. 03:23Tommy Built T7 Ordeal
  9. 03:43CMMG Banshee Reliability
  10. 04:17Handguard Gripes
  11. 04:454.6x30mm Suppressor Testing
  12. 05:44Reachback Rhino S Performance
  13. 06:04MP7 at Home Reliability
  14. 06:36Mag Dump at 160 Yards
  15. 07:07Showcasing AS Designs ARC Fire Platform
  16. 07:45New Range Toy Fun

Frequently Asked Questions

What is the AS Designs ARC Fire and how does it relate to the MP7?

The AS Designs ARC Fire is a component used in this build to allow a CMMG Banshee in 4.6x30mm to function similarly to an HK MP7 submachine gun, creating an 'MP7 at home' concept.

What modifications are needed to build a CMMG Banshee 4.6x30mm like an MP7?

Building a CMMG Banshee 4.6x30mm to emulate an MP7 with an ARC Fire requires significant modifications, including Dremel work and extensive tuning of buffer weights, spring lengths, and buffer tubes for reliable operation.

How does the recoil of the 4.6x30mm CMMG Banshee compare to 5.56?

The recoil of the 4.6x30mm CMMG Banshee with the ARC Fire is described as very soft and comparable to a well-tuned 5.56 AR-15, making it a comfortable shooting experience.

What are the main drawbacks of the CMMG Banshee platform for this build?

A primary drawback noted is the handguard design on the CMMG Banshee, which is positioned too close to the gas block, making some M-Lock slots unusable and impacting accessory mounting.

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