The Fastest Shooting 300Blackout I Own

Published on March 9, 2025
Duration: 9:49

This guide details the advanced tuning process for a custom 300 Blackout AR-15 build, specifically focusing on achieving reliable operation with subsonic ammunition. The video, presented by a knowledgeable firearms instructor, covers component selection and adjustment, including gas system tuning with an adjustable block, buffer weight selection, and spring choices. It emphasizes the importance of proper tuning for different ammunition types and highlights potential issues like trigger pin security.

Quick Summary

To reliably run subsonic 300 Blackout ammunition in an AR-15, especially with a Law Tactical folder, tune the gas system with an adjustable block set to pistol-length and nearly fully open. Pair this with a heavier buffer, such as an H1, and a Springco Yellow Spring for optimal cycling and recoil management.

Chapters

  1. 01:10Introduction to 300 Blackout Build
  2. 01:27Channel Support & Sponsors
  3. 01:57Disclosure and Ammo Sponsors
  4. 02:20Suppressor Details: Dead Air Sandman-X
  5. 02:55Barrel and Gas System Tuning
  6. 03:37Handguard and Light Setup
  7. 04:28Sling Attachments
  8. 04:48Upper Receiver and BCG
  9. 05:09Optics and Magnifier Setup
  10. 05:24Charging Handle
  11. 05:30Lower Receiver and Magwell
  12. 05:58Trigger Assessment: FRT15
  13. 07:06Grip and Folding Brace
  14. 07:24Buffer System Tuning for Subsonics
  15. 08:04Buffer Tube Hardware
  16. 08:12Pistol Brace: SB Tactical SBA3
  17. 08:20Sling Recommendation
  18. 08:30Cerakote and Future Products
  19. 09:00Build Conclusion and Training Advice

Frequently Asked Questions

How do you tune a 300 Blackout AR-15 for subsonic ammunition?

Tuning for subsonic 300 Blackout involves using an adjustable gas block set to pistol-length, nearly fully open. A heavier buffer like an H1 with a Springco Yellow Spring is recommended to manage cycling and recoil for reliable operation.

What are the key components of this custom 300 Blackout build?

This build features an 8.5-inch US Arms Co barrel, Dead Air Sandman-X suppressor, Midwest Industries handguard, BCM upper/lower receivers, an EOTech optic with Unity riser, and an FRT15 trigger. It also incorporates a Law Tactical folder for compactness.

What is the advantage of the Radian ADAC lower receiver and Driven Arms Co Magwell?

The Radian ADAC lower offers excellent build quality and ergonomics. The Driven Arms Co Magwell significantly aids in faster and more reliable magazine reloads, especially in low-light conditions or when using night vision.

How does the FRT15 trigger function, and what are its limitations?

The FRT15 trigger provides safe, semi-automatic, and rapid-fire (FRT) modes. While its semi-auto pull isn't the lightest, it has a clean break and aggressive reset suitable for combat. Pin security is crucial, often requiring Loc-Tite.

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