The Mac11 she told you not to worry about!

Published on March 20, 2025
Duration: 13:16

This video provides a detailed overview and range test of a custom MAC-11 build, highlighting its 3D-printed lower receiver and various aftermarket components. The presenter discusses the firearm's performance, including its ammunition specificity and component reliability issues, offering insights into its build process and potential drawbacks.

Quick Summary

This custom MAC-11 build features a Velocity Firearms upper and a 3D-printed lower receiver made with Nissan PLA Plus on an Ender 3 V2. It is highly ammunition-specific, with only Blazer 115-grain FMJ functioning reliably, as other types can cause failures to feed and break firing pin springs.

Chapters

  1. 00:00Introduction & Build Overview
  2. 01:14MAC-11 Build Details
  3. 01:34Upper Receiver & Barrel
  4. 01:393D Printed Lower Receiver
  5. 01:57Nissan PLA Plus Material
  6. 02:02Ambidextrous Controls
  7. 02:40Strike Industries Folder/Brace
  8. 03:02Strike Industries Cookie Cutter Brake
  9. 03:25Clar Light Installation
  10. 03:53Apex Predator V5 Optic
  11. 04:23Metatactical Grip & Mag Holder
  12. 04:38Magazine Compatibility
  13. 04:53Ammunition Specificity Issues
  14. 05:10Firing Pin Spring Failures
  15. 05:39AR-15 Lower Parts Kit
  16. 06:04Range Test Setup
  17. 06:37Shooting Impressions & Gas Blast
  18. 08:13Failure to Feed Demonstration
  19. 09:18Target Practice at 200 Yards
  20. 10:00Magazine Extension Issues
  21. 10:41Accuracy at Distance
  22. 10:54Strike Industries Brake Adapter
  23. 12:16Drywall Penetration Test
  24. 12:41Drywall Test Results
  25. 13:10Outro & Farewell

Frequently Asked Questions

What are the key components of this custom MAC-11 build?

This custom MAC-11 features a Velocity Firearms upper, a 3D-printed lower receiver made with Nissan PLA Plus on an Ender 3 V2, a Strike Industries brace folder, a Cookie Cutter brake, a Clar light, and a Metatactical grip. It utilizes an AR-15 lower parts kit and is compatible with Glock magazines.

What ammunition is recommended for this MAC-11 build?

The firearm is highly ammunition-specific. Only Blazer 115-grain Full Metal Jacket rounds have proven reliable. Attempting to use other ammunition types has led to failures to feed and broken firing pin springs.

What issues were encountered during the testing of this MAC-11?

The primary issues encountered were ammunition specificity, leading to failures to feed and broken firing pin springs. Additionally, magazine extensions on Glock 17 mags prevented the bolt from catching, and the Strike Industries brake required careful installation.

How does the Strike Industries Cookie Cutter brake perform on this MAC-11?

The Cookie Cutter brake effectively reduces recoil, pulling it forward. However, it directs a significant amount of gas, which can be uncomfortable for shooters, especially those standing close to the muzzle.

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