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Premium Folding Brace by Larry, July 14, 2026
A well-built, very adjustable but high-priced premium folding brace. Strong spring tension needed to hold hinge unfolded makes it difficult to fold. Unknown if spring will get loose with use. Perhaps a button release on hinge would be better. DId not...
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very well built by lee, Verified Owner, April 21, 2026
expensive but well worth it. recommend pairing a with gear head tailhook (also mucho $) 0% buyers remorse
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Product Info for A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace

The HDA3 is a modular stock/brace system developed from a collaboration between Haga Defense and A3 Industries. The HDA3 was designed specifically to integrate seamlessly across dozens of firearm platforms without sacrificing strength or aesthetics to do so. Folding Steel Hinge: The HDA3 utilizes a steel hinge assembly, ensuring a strong lockup in the straight and folded position that will not degrade with use. The HDA3 will by default fold to the left side canted at 3.5 degrees. Right side folding variants will be available at a later date.image

Strong Bones: The HDA3 is designed with all metal internal components for maximum durability. An aluminum cheek riser button and length adjustment latch both interface with an extruded aluminum spine that ties into the steel hinge.

Stock & Brace Configurations: The HDA3 is available as a stock with an injection molded extension and rubber buttpad or as a brace with an injection molded extension designed to accept a variety of arm braces. See below for brace compatibility.

Adjustment: The HDA3's length can be adjusted in .5" increments between 7 positions. The cheek riser can be used in three positions. In the lowered position, raised .25" or raised .5". Both adjustments can easily be manipulated one-handed.

Specifications for A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace:

Manufacturer: A3 Industries
Gun Make: Universal
Gun Model: Universal
Length: 7.9 in
Stock/Brace Material: Polymer

Features of A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace

  • Aluminum Extruded Spine
  • 3 Position Adjustable Cheek Riser
  • Rubberized Buttpad
  • 7 length of pull adjustments
  • HD Steel folding hinge

Package Contents:

  • A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace

A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace Orderable Models

List of Orderable Models

  • A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace, Black, HDA3-1913-A3-B-LF-BLK , MPN: HDA3-1913-A3-B-LF-BLK , UPC: 810151873251 , Code: 69H-SBF-HHGB65-HDA3-1913-A3-B-LF-BLK
  • A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace, Grey, HDA3-1913-A3-B-LF-GRY , MPN: HDA3-1913-A3-B-LF-GRY , UPC: 810151873282 , Code: 69H-SBF-HHGB65-HDA3-1913-A3-B-LF-GRY
  • A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace, Flat Dark Earth, HDA3-1913-A3-B-LF-FDE , MPN: HDA3-1913-A3-B-LF-FDE , UPC: 810151873268 , Code: 69H-SBF-HHGB65-HDA3-1913-A3-B-LF-FDE
  • A3 Industries Hda3 Hybrid Polymer Universal 1913, Folding Stabilizing Brace, Olive Drab Green, HDA3-1913-A3-B-LF-ODG , MPN: HDA3-1913-A3-B-LF-ODG , UPC: 810151873275 , Code: 69H-SBF-HHGB65-HDA3-1913-A3-B-LF-ODG
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Last updated 2026-09-29 UTC.