The " Sig MCX Spear XM7 at Home " AR10 Build | 1000 Rounds Later

Published on April 19, 2023
Duration: 10:58

This video details a custom AR-10 build inspired by the Sig MCX Spear XM7, focusing on a 13.5-inch pinned and welded to 16-inch configuration. The builder discusses component choices, including Aero Precision receivers, a Ballistic Advantage barrel, and an Arisaka handguard, along with addressing assembly challenges and potential improvements. The build aims for a balance of maneuverability and .308 caliber performance, with considerations for suppressor compatibility.

Quick Summary

This custom AR-10 build, inspired by the Sig MCX Spear XM7, features a 13.5-inch Ballistic Advantage barrel pinned and welded to 16 inches. Key components include Aero Precision M5 receivers, an Arisaka handguard, and a SIG MSR Tango optic. The builder addressed buffer system challenges and handguard attachment issues, recommending an adjustable gas block for short .308 builds.

Chapters

  1. 00:00Introduction & Build Goal
  2. 00:36Existing .308 Firearms
  3. 01:04Reason for Short Barrel Build
  4. 01:44Receiver & Cerakote Details
  5. 02:21Handguard Issues & Assembly
  6. 04:08Muzzle Device & Suppressor Plans
  7. 05:52Optic Selection (SIG MSR Tango)
  8. 06:55Charging Handle & Magazine
  9. 07:14Grip & Buffer Tube
  10. 07:35Buffer System Challenges (.308 vs AR-15)
  11. 08:20Barrel & Adjustable Gas Block
  12. 09:00Gassing & Cycling Performance
  13. 09:44Accuracy & Range Time
  14. 10:30Comparison to Sig Spear & Final Thoughts

Frequently Asked Questions

What are the key components of this custom AR-10 build inspired by the Sig MCX Spear XM7?

The build features Aero Precision M5 receivers, a 13.5-inch Ballistic Advantage barrel pinned and welded to 16 inches, an Arisaka handguard, and a SIG MSR Tango optic. It also includes a Wilson Combat Surefire War Comp muzzle device.

What challenges were encountered during the assembly of this short-barreled .308 AR build?

A significant challenge was the buffer system; an AR-15 buffer with a .308 spring caused cycling issues. Switching to a dedicated .308 buffer resolved this. Additionally, the handguard's barrel nut attachment became loose, requiring re-tightening.

Why did the builder choose a short barrel (13.5" pinned to 16") for this .308 AR-10 build?

The builder opted for a shorter barrel to enhance maneuverability, especially for potential home defense scenarios, while still maintaining legal rifle length. This configuration also allows for a more flush suppressor integration.

What are the recommendations for gas systems on short-barreled .308 AR platforms?

An adjustable gas block is highly recommended for short-barreled .308 builds. This allows fine-tuning to prevent over-gassing or under-gassing, ensuring reliable cycling and proper function, which is crucial for these compact platforms.

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