The Greissele | A 13.9” Do-All AR-15 Build

Published on July 10, 2025
Duration: 11:51

This video details the construction of a custom 13.9-inch AR-15 build, dubbed 'The Greissele,' by Classic Firearms staff member Brandon. The build emphasizes high-end components, starting with a Griffin Mark 2 lower and a Geissele Super Duty upper, incorporating a Geissele SSA-E X trigger, Radian Talon safety, and a HuxWrx Flow 556 Ti suppressor. The build showcases thoughtful component selection for performance and ergonomics, including an EOTech Vudu LPVO with a Unity FAST mount and an offset red dot.

Quick Summary

This custom 13.9-inch AR-15 build, 'The Greissele,' features a Griffin Mark 2 lower and Geissele Super Duty upper. Key components include a Geissele SSA-E X trigger, Radian Talon safety, HuxWrx Flow 556 Ti suppressor, and an EOTech Vudu LPVO on a Unity FAST mount with an offset Swampfox Kraken red dot. The 13.9-inch barrel is pin and welded to meet legal rifle length requirements without an SBR stamp.

Chapters

  1. 00:24Introduction to Custom AR Builds
  2. 00:38Journey from Budget to High-End ARs
  3. 01:27Choosing Geissele Super Duty as Baseline
  4. 02:07Griffin Mark 2 Lower Receiver
  5. 02:34Geissele SSA-E X Trigger Selection
  6. 03:03Radian Talon Safety Selector
  7. 03:22CZ Shadow 2 Grip Influence
  8. 04:09Geissele Lower Parts Kit & Rail Scales
  9. 04:39Ambidextrous Lower Receiver Features
  10. 05:28Buffer Tube and Magpul Stock
  11. 06:39Geissele Super Duty Upper Receiver
  12. 07:24Geissele Charging Handle and BCG
  13. 08:29HuxWrx Suppressor and Gas Block
  14. 09:39Streamlight TLR-VIR II (SMS Laser)
  15. 10:16EOTech Vudu & Swampfox Kraken Optics
  16. 11:24Build Conclusion

Frequently Asked Questions

What is the primary purpose of the 13.9-inch barrel in this custom AR-15 build?

The 13.9-inch barrel is a key component in this custom AR-15 build, 'The Greissele.' It's intentionally chosen and then pin and welded to a muzzle device to achieve a legal rifle length without requiring an SBR tax stamp, offering a balance of maneuverability and legal compliance.

What are the main components of the Geissele Super Duty upper receiver assembly?

The Geissele Super Duty upper receiver assembly includes a Geissele charging handle, selected for its gas-busting properties, and a Geissele enhanced bolt carrier group (BCG) with a nano-coating for smooth operation and durability. It also features a Geissele Super Duty gas block.

Why was the EOTech Vudu LPVO paired with a Unity FAST mount and an offset red dot?

The EOTech Vudu LPVO is mounted on a Unity FAST mount set at 1.93 inches for optimal eye relief and comfortable shooting. This setup also allows for a quick transition to the offset Swampfox Kraken red dot sight, which is beneficial for non-dominant eye shooting or close-quarters engagements.

What makes the Griffin Mark 2 lower receiver a notable choice for this build?

The Griffin Mark 2 lower receiver was chosen for its ambidextrous functionality, including a bolt release that can be actuated from both sides. This feature supports versatile training scenarios and enhances operational efficiency for shooters of all preferences.

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