PCR 3D Printed AR-15 Upper and Lower

PCR 3D Printed AR-15 Upper and Lower Features

This design by Protofirearms stands out for its work-in-progress innovation, allowing users to be part of an evolving project with real-world testing. The models are preset for optimal layer orientation, ensuring maximum strength once printed and assembled, making it a reliable choice for firearm enthusiasts.

Key highlights include:

• Custom Assembly Design: Requires specific hardware like M4 screws and nuts to secure critical components such as the handguard and barrel.
• Detailed Assembly Guidance: Initial steps provided for aligning parts like the Lower Threads (LT) and Lower Main (LM), ensuring a precise fit.
• Community-Driven Development: Backed by Protofirearms’ YouTube channel for additional insights and video support.

Built with durability in mind, this AR-15 combo is a testament to the potential of 3D printing in firearms customization. Note that these models are still under development, so users should proceed with caution and at their own risk.

Difficulty & Build Time

• Skill Level: Intermediate
• Estimated Build Time: 1-2 days (including printing and assembly)
• Required Experience: Familiarity with 3D printing, basic firearm assembly, and safe handling practices

Hardware and Tools Required

Required Hardware

• x3 M4x40mm Hex Head Cap Socket Screws
• x3 M4 Nylon Lock Nuts
• x3 M4 Washers

Recommended Tools

• 3D Printer (FDM compatible)
• Rubber Mallet (for seating tight-fitting parts)
• Allen Key Set (for M4 screws)
• File or Sandpaper (for post-processing printed parts)

PCR 3D Printed AR-15 Upper and Lower Parts

This downloadable file includes STL models for the AR-15 upper and lower receivers, designed by Protofirearms for optimal performance. The parts are preset for the best layer orientation to ensure structural integrity post-printing. Key components include the Lower Threads (LT), Lower Main (LM), Stock Ring, and Takedown Supports, each requiring precise assembly as outlined in the instructions.

For printing, a 100% infill is recommended to maximize strength, with a layer height of 0.15mm and minimal to no cooling fan to enhance layer adhesion. Materials like PETG or ABS are suggested for their durability under stress. Users can access a detailed PDF guide for assembly steps at the provided link for a seamless build process.

Printer Compatibility & Settings

The PCR 3D Printed AR-15 Upper and Lower models are compatible with most FDM 3D printers capable of handling detailed and dense prints. Recommended materials include PETG or ABS due to their strength and heat resistance, critical for firearm components. PLA is not advised due to its lower durability.

Print settings should prioritize strength with 100% infill and a 0.15mm layer height for optimal results. Minimal cooling fan usage is suggested to improve layer bonding, and users should ensure their printer bed is leveled for precision. Always test small sections of the model if unsure about printer capabilities or material compatibility.

Conclusion

The PCR 3D Printed AR-15 Upper and Lower combo offers a thrilling project for 3D printing and firearms enthusiasts, blending innovation with hands-on craftsmanship. With Protofirearms’ design, you’re not just building a component—you’re joining a community pushing the boundaries of DIY firearm technology. Dive into this work-in-progress model with caution, follow the detailed guides, and explore more content on Protofirearms’ YouTube channel for additional support.