A3 & Haga Defense HDA3 Brace - The Most Modular Brace & Stock I’ve Ever Used

Published on May 20, 2025
Duration: 5:41

The A3 & Haga Defense HDA3 Hybrid Folding Brace offers extensive modularity and adjustability for various platforms. It features a 1913 Picatinny adapter, adjustable cheek riser, seven-position length of pull, and multiple QD sling mount points. The brace is constructed from high-strength, glass fiber-reinforced nylon and features aluminum adjustment buttons and steel QD sockets, ensuring durability.

Quick Summary

The A3 & Haga Defense HDA3 Hybrid Folding Brace is exceptionally modular, featuring interchangeable adapters for platforms like AR-15, CZ Scorpion, and MP5. It offers seven positions for adjustable length of pull (8.16-11.6 inches) and a three-slot adjustable cheek riser, all constructed from durable 6061 aluminum and 30% glass fiber-reinforced nylon.

Chapters

  1. 00:14Introduction to A3 & Haga Defense HDA3 Brace
  2. 00:46Origin and Partnership: A3 & Haga Defense
  3. 00:59Modularity and Platform Compatibility
  4. 01:121913 Picatinny Adapter Explained
  5. 01:26Brace vs. Stock Version
  6. 01:49Supported Firearm Platforms
  7. 02:14Example Setup: CZ Scorpion
  8. 02:31Adjustable Cheek Riser Features
  9. 02:41Adjustable Length of Pull Features
  10. 02:53QD Sling Mount Points
  11. 03:01Folding Mechanism Operation
  12. 03:25Additional QD Sling Mount
  13. 03:34Adapter Construction Details
  14. 03:41Brace Length Specifications
  15. 03:51Adjustment Slot Confirmation
  16. 03:55Adjustment Button Material
  17. 04:02Internal Construction and Durability
  18. 04:09Polymer Material Details
  19. 04:19Available Color Options
  20. 04:23Made in USA
  21. 04:25Availability on Rainineer Arms
  22. 04:38Converting to SPR Stock Configuration
  23. 04:56Adapter Swapping for Modularity
  24. 05:24Viewer Feedback Request
  25. 05:36Final Recommendation and Availability

Frequently Asked Questions

What makes the A3 & Haga Defense HDA3 Brace so modular?

The HDA3 Brace is highly modular due to its interchangeable accessories and adapters. Users can swap out the 1913 Picatinny adapter for platform-specific ones, allowing it to fit a wide range of firearms like the AR-15, CZ Scorpion, MP5, and more.

What are the adjustment options for the A3 & Haga Defense HDA3 Brace?

This brace offers significant adjustability with seven positions for length of pull, extending from 8.16 to 11.6 inches. It also features a three-slot adjustable cheek riser for optimal sight alignment.

What materials are used in the construction of the A3 & Haga Defense HDA3 Brace?

The brace utilizes a durable construction with a 6061 aluminum adapter that is hardcoat anodized. The polymer components are made from injection-molded, 30% glass fiber-reinforced nylon, ensuring a heavy-duty build.

Where can I purchase the A3 & Haga Defense HDA3 Brace?

The A3 & Haga Defense HDA3 Brace, along with adapters for various platforms, is currently available for purchase on Rainineer Arms. They also offer it for other platforms like the MPX, MP5, and Stribog.

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