The UBAR2 3D Printable AR15 Lower

The UBAR2 3D Printable AR15 Lower Features

The UBAR2 sets itself apart with innovative reinforcement techniques that address common weaknesses in 3D printed AR15 lowers. By integrating hardware store metal parts like a U-Bolt for the rear tower and rod end eye bolts for the front takedown lug, this design achieves exceptional strength, making it one of the most durable printable lowers at the time of its release.

Key features include:

• Eight Variants Available: Choose between the standard UBAR2 and the UBAR2C (with extra clearance for side-charging or nonstandard uppers).
• High-Shelf and Low-Shelf Options: Tailor your build to specific triggers like FRT or other configurations.
• Enhanced Compatibility: Works with a wide range of AR15 parts for versatile builds.

This design prioritizes both functionality and accessibility, ensuring builders can create a reliable lower receiver with minimal hassle. Whether you're a seasoned builder or a curious newcomer, the UBAR2 offers a practical and sturdy foundation for your AR15 project.

Difficulty & Build Time

• Skill Level: Intermediate
• Estimated Build Time: 1-2 days (including printing and assembly)
• Required Experience: Basic knowledge of 3D printing and familiarity with AR15 components recommended

Hardware and Tools Required

Required Hardware

• U-Bolt (for rear tower reinforcement)
• Rod end eye bolts (for front takedown lug reinforcement)
• Additional AR15 compatible parts (depending on chosen variant and build goals)

Recommended Tools

• 3D printer (compatible with recommended materials)
• Basic hand tools (screwdrivers, wrenches for hardware installation)
• Sanding or finishing tools (for post-processing printed parts)
• Drill (if minor adjustments are needed for fitment)

The UBAR2 3D Printable AR15 Lower Parts

This downloadable file includes STL files for the UBAR2 Lower Receiver, available in eight distinct variants to suit various build preferences. You’ll find four UBAR2 options and four UBAR2C versions, with sub-variants for high-shelf and low-shelf configurations to accommodate different trigger setups. These files are designed for precision, ensuring a proper fit with a wide range of AR15 components.

For optimal results, print with high-strength materials like PETG or ABS to withstand the stresses of firearm use. Ensure your printer bed is leveled and use a moderate infill percentage (around 50-70%) for a balance of strength and material efficiency. Post-processing, such as sanding or minor drilling, may be necessary for a perfect fit with hardware reinforcements.

Printer Compatibility & Settings

The UBAR2 design is compatible with most FDM 3D printers capable of handling durable materials like PETG or ABS, which are recommended for their strength and heat resistance. Avoid using PLA due to its lower durability under stress. A printer with a build volume of at least 200x200x200mm is ideal to accommodate the lower receiver’s dimensions.

Recommended settings include a layer height of 0.2-0.3mm for detail and strength, a nozzle temperature suited to your material (around 230-250°C for PETG), and a heated bed (70-80°C) to prevent warping. Supports may be required for overhangs, depending on the variant, so ensure your slicer settings are optimized. Always double-check the build instructions provided in the PDF guide for specific tips on achieving a successful print.

Conclusion

The UBAR2 3D Printable AR15 Lower is a game-changer for DIY firearm enthusiasts, offering unmatched strength and versatility through its reinforced design and multiple variants. With detailed build instructions available in the accompanying PDF guide, builders can confidently tackle this intermediate project and create a reliable AR15 lower receiver. Join the community at thegatalog.com to share your build, gain insights, and explore more innovative designs like this one.