HD-22LR (or HD-22), which is a popular “fully printed” .22LR semi-automatic rifle design

  • The Future is Printed: 100% printed frame, bolt, and receiver. Science fiction meets the firing range. 🚀
  • Rimfire Revolution: My new HD-22LR build is complete. No buffer tube, no problem. 🛠️
  • Precision in PLA+: Putting the “Heavy Duty” in HD-22. Fully printed and ready for testing. 🎯
  • From Bed to Range: Just pulled this HD-22LR off the printer. 3D2A at its finest. 🖨️✨

The HD-22LR is a lightweight, semi-automatic rifle designed for maximum 3D printability. Unlike traditional AR-style builds, this “Heavy Duty” (HD) model is engineered to be fully printed, including the bolt and receiver, significantly reducing the need for expensive metal parts kits.

Key Features:

  • Bufferless Design: Uses a blowback system that eliminates the need for a buffer tube, allowing for a more compact profile or folding brace.
  • High Printability: Optimized for common materials like PLA+ or Carbon Fiber Nylon, it can be produced on standard desktop printers.
  • Modular Build: Features integrated Picatinny rails for optics and accessories, making it a highly customizable rimfire platform.
  • Cost-Efficient: By utilizing a printed bolt and simple hardware store components (like springs and pins), it offers a functional build at a fraction of the cost of retail firearms.