HDA3
HDA3 Hybrid Polymer Stock - Universal 1913
HDA3 Hybrid Polymer Stock - Universal 1913
SKU:HDA3-1913-A3-S-LF-FDE
Fits these firearms:FN SCARGForce BladeSpringfield KunaTaurus RPC
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Specifications
- Weight: 1.5 lb
- Mount type: 1913 Picatinny
- Finish: BlackFlat Dark EarthGreyOlive Drab Green
- Country of origin: USA
Product Description
The HDA3 is a modular stock and brace system developed through a collaboration between Haga Defense and A3 Industries. Designed to integrate cleanly across a wide range of firearm platforms, the HDA3 delivers strength, adjustability, and durability in a familiar, low-profile package.
This universal picatinny variant mounts directly to any mil-spec 1913 picatinny rail. 2.50" of rail space is recommended. The HDA3 is designed, manufactured, and assembled in the USA.
Features
Heavy-Duty Folding Hinge
The HDA3 uses a nitride-coated 17-4 stainless steel hinge for a strong, consistent lockup in both the folded and deployed positions. The standard configuration folds to the left at a 3.5-degree cant. Right-folding configurations are planned for a future release.
Hybrid Construction
Metal internal components provide strength where it matters most. The aluminum cheek-riser button and length-adjustment latch interface with a 6061 aluminum extrusion that connects directly to the steel hinge. Exterior components are injection-molded from 30% glass-fiber-reinforced nylon for a durable, lightweight shell.
Stock and Brace Configurations
The stock configuration includes an injection-molded extension with a textured Santoprene TPE buttpad. The brace configuration includes an injection-molded extension designed to accept compatible arm braces.
Tool-Free Adjustment
The HDA3 offers seven length positions in 0.50-inch increments. The cheek riser can be set to three heights: flush, +0.25 inch, or +0.50 inch. Both adjustments can be operated easily with one hand.
Multiple Sling-Mounting Options
The rear of the HDA3 includes an integrated sling loop and two steel QD sockets. Three additional QD mounting points are machined into the aluminum firearm adapter.
Specifications
- Universal Picatinny(1913) mounting interface
- 6061 hardcoat-anodized aluminum adapter
- Nitride-coated 17-4 stainless steel folding hinge
- Left-side folding with a 3.5-degree cant
- Seven length positions with 0.50" adjustment increments
- 6061 hardcoat-anodized aluminum extrusion
- 7075 aluminum locking latch
- Three-position cheek riser: 0", +0.25", and +0.50"
- Hardcoat-anodized 6061 aluminum cheek-riser button
- 30% glass-fiber-reinforced nylon exterior components
- Santoprene TPE buttpad on stock configuration
- Available in Black, FDE, ODG, and Gray
Length
- Stock configuration: 8.36"–11.36"
- Brace configuration without brace installed: 8.70"–11.70"
Weight
- Stock configuration: 1 lb. 5.6 oz.
- Brace configuration without brace installed: 1 lb. 4.1 oz.
Designed, manufactured, and assembled in the USA.
I recently purchased this product ie (January 2026K) & I have been completely satisfied & content with it. The entire construction, build quality,craftsmanship & materials are second to none. The Butt Stock was very simple to install & configure to my size & length of pull. I couldn't see myself putting anything less on my firearm platform. Thank you to all who put so much thought & really thinking :thinking::thought_balloon: how this stock can be used on multiple carbines.
Great customer service and awesome product. Will purchase from again…thank you!
Have not installed it yet waiting on proper paperwork!
Amazing product. This stock exceeded expectations. Very high quality aluminum spine and durable polymer. The gray was a great choice. I like it so much Im going to buy a few more
Too expensive for a piece of turd
In lieu of spending $600 on a used ACR stock for a folding (no buffer) AR build, I eagerly awaited this stock only to find the folding mechanism to be cumbersome and difficult to operate. The telescoping aspect and comb appear to function well, but the defining characteristic of the build (folding) is, sadly, a massive disappointment, being yet even more difficult to operate than even a CNC Warrior mechanism. My friend’s teenage children, ever the source of honesty, claim this stock “doesn’t know which bathroom to use. ”