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Code: 69H-SBF-HHGB85-HDA3-G3-A3-B-LF-FDE
MPN: HDA3-G3-A3-B-LF-FDE
UPC: 810151872940

Code: 69H-SBF-HHGB85-HDA3-G3-A3-B-LF-ODG
MPN: HDA3-G3-A3-B-LF-ODG
UPC: 810151872957

Code: 69H-SBF-HHGB85-HDA3-G3-A3-B-LF-GRY
MPN: HDA3-G3-A3-B-LF-GRY
UPC: 810151872964

Code: 69H-SBF-HHGB85-HDA3-G3-A3-B-LF-BLK
MPN: HDA3-G3-A3-B-LF-BLK
UPC: 810151872933
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.![]()
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.
| Manufacturer: | A3 Industries |
| Gun Make: | Heckler & Koch |
| Gun Model: | Heckler & Koch HK91 |
| Length: | 7.9 in |
| Stock/Brace Material: | Polymer |