Product Overview
The Haga Defense HK91/G3 1913 Adapter adds a Picatinny (1913) rail for mounting stocks or braces to HK91/G3 platforms and clones. Machined from 7075 aluminum with a built-in QD sling mount, this lightweight upgrade provides a solid mounting interface without permanent modifications to your classic rifle.
Specifications
- Material: 7075 aluminum
- Finish: Mil-A-8625 Type III Class 2 hardcoat anodize, black
- Features: Built-in QD sling mount
- Included: 1913 adapter, Choate rubber buffer, mounting hardware
- Made in: USA
Compatibility and Installation Notes
- Compatible with HK91, G3, and clones (PTR91, PTR-PDW, HK 93, 33, 53, etc.) when fitted with the same style endcap as pictured below

- Will not work with factory buffers
- No permanent modifications required
Always ensure your firearm configuration complies with all applicable federal, state, and local laws.
Installation Instructions
- Safety First: Before beginning installation, make sure the firearm is completely unloaded, the chamber is empty, and the safety is engaged. Remove the magazine, visually and physically inspect the chamber to confirm it is empty, and point the firearm in a safe direction at all times.
- No further installation instructions available at this time.