Bubba's MCX: The Ugliest Gun Ever?

Published on August 24, 2025
Duration: 15:42

This video details the modification of a SIG MCX Regulator (MCXR) to remove its California-compliant features and install a pistol grip. The process involves using a Mossberg 500 pistol grip buffer tube adapter, requiring some Dremel work for proper fitment. The modification results in a non-California compliant firearm, allowing for standard capacity magazines and a different ergonomic feel. The presenter also discusses the MCXR's features, its discontinuation, and its comparison to the MCX Spear LT.

Quick Summary

The SIG MCX Regulator (MCXR) is a California-compliant version of the SIG Sauer MCX rifle, featuring 'cucked' features to meet state regulations. It has reportedly been discontinued by SIG Sauer, leading to reduced pricing. Modifications for non-compliance often involve replacing the stock with a pistol grip using adapters like the Mossberg 500 type.

Chapters

  1. 00:00Intro & Channel Promo
  2. 00:55Music Break
  3. 01:32Introducing the SIG MCX Regulator (MCXR)
  4. 02:00Why the MCXR Was Acquired
  5. 02:18MCXR vs. MCX Spear LT Upper
  6. 02:45Original Pricing & Discontinuation
  7. 03:12Included Accessories & Initial Thoughts
  8. 03:29Sponsor: Aves Engineering
  9. 03:52Ergonomics & Sight Setup
  10. 04:02Mossberg 500 Stock Adaptation
  11. 04:34Trigger & Safety
  12. 04:42First Shots & Compensator Effect
  13. 05:04Modularity & Barrel Swaps
  14. 05:30Arca-Swiss Rail Feature
  15. 05:43Compatibility with MCX Lowers
  16. 06:09Enhanced Bolt Carrier Group & Triggers
  17. 06:21Preparing for Modifications
  18. 06:31Introducing the 'Bubba' MCX
  19. 06:40The 'Bubba' MCX Build
  20. 07:01Pistol Grip Installation Details
  21. 07:23Non-California Compliant Status
  22. 07:35Testing Ergonomic Changes
  23. 07:44Shooting the 'Bubba' MCX
  24. 08:06Painful Ergonomics of the 'Bubba' Build
  25. 08:33Testing Upper on Standard MCX Lower
  26. 08:45Reverting to a Standard MCX Lower
  27. 09:01MCX Upper on AR-15 Lower (with conversion)
  28. 09:12Shooting with MCX Lower
  29. 09:24Improved Follow-up Shots
  30. 09:46Reload Procedure Analysis
  31. 10:24Practicing Reloads
  32. 10:27Compensator Concussion Revisited
  33. 11:13Attempting to Bump Fire
  34. 11:36Trigger Weight & Disappointment
  35. 11:43Mag Change Test
  36. 12:01Duramag Lock Open Issue
  37. 12:11Overall Shooting Experience
  38. 12:18Uniqueness of the 'Bubba' Build
  39. 12:32Conclusions on the 'Bubba' MCX
  40. 13:11Value Proposition of the MCXR
  41. 13:50Praise for Designers & History
  42. 14:01Patreon & Support
  43. 14:25Outro & Thanks
  44. 15:28It's Bubba Time

Frequently Asked Questions

What is the SIG MCX Regulator (MCXR)?

The SIG MCX Regulator (MCXR) is a California-compliant variant of the SIG Sauer MCX rifle. It features specific modifications to meet state regulations, often including a fixed magazine or limited capacity and a different stock configuration, making it distinct from standard MCX models like the Spear LT.

How can the SIG MCX Regulator be modified for non-California compliance?

To make the MCX Regulator non-California compliant, the original stock can be replaced with a pistol grip. This typically involves using an adapter like the Mossberg 500 pistol grip buffer tube adapter, which may require minor Dremel work for a secure fit, and then attaching a standard M4 buffer tube and pistol grip.

What are the advantages of the MCX platform's modularity?

The MCX platform is highly modular, allowing for easy barrel swaps between calibers like 5.56, .300 Blackout, and 7.62x39 without a barrel nut. It uses a clamp-based system for barrel attachment and features an enhanced bolt carrier group that enables the use of standard AR-15 triggers, including fun triggers like the FRT.

Is the SIG MCX Regulator still in production?

According to reports, SIG Sauer has discontinued the MCX Regulator. This has led to the firearms being sold at significantly reduced prices, making them a potentially attractive option for those seeking an MCX Spear LT upper at a lower cost.

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