SFFA V3 (Select Fire Full Auto)

SFFA V3 (Select Fire Full Auto) Features

The SFFA V3 offers unparalleled customization for AR15 platforms with its select-fire capability. This drop-in auto sear (DIAS) transforms a standard MIL-SPEC AR15 FCG into a machine gun setup, allowing users to switch between safe, semi-auto, and full-auto modes with the provided 3D selector.

Key highlights include:

• Versatile Selector Design: Use the 3D selector for full functionality or retain the MIL-SPEC selector for a traditional DIAS setup with safe and full-auto modes only.
• Legal Compliance Note: The 3D selector, when used without the sear, operates as safe/semi/semi, ensuring no hammer follow in the third position.
• Durability Focus: Engineered for longevity, even when printed in plastic, eliminating concerns over wear.

This design prioritizes user control while acknowledging the significant legal risks associated with machine gun configurations. Always consult local laws before proceeding.

Difficulty & Build Time

• Skill Level: Advanced
• Estimated Build Time: 8-12 hours
• Required Experience: Prior experience with AR15 assembly, 3D printing, and firearm mechanics is essential due to the complexity and legal implications.

Hardware and Tools Required

Required Hardware

• x1 Standard (MIL-SPEC) AR15 FCG (avoid super safe cut triggers to prevent full-auto in safe mode)
• x1 AR15 Bolt Catch Spring (for sear)
• x1 AR15 Bolt Catch Roll Pin (cut down if using non-M16 cut lower)
• Alternatively, repurpose bolt catch components from the lower as they are not required for operation

Recommended Tools

• 3D Printer with precise calibration
• Cutting tools for roll pin modification (if needed)
• Standard AR15 assembly tools (punches, hammers)
• Calipers for precise measurement during assembly

SFFA V3 (Select Fire Full Auto) Parts

The SFFA V3 file pack includes meticulously oriented STL files for the drop-in auto sear, custom selector, and housing components, complete with brims and supports where necessary. STEP files are also provided, though not pre-oriented for printing. The pack has seen multiple updates (up to V17 as of 07/04/2024), incorporating enhancements like burst sear options, true full-auto sears for real FA FCGs, and improved 45-degree selectors.

Recommended print settings include a 220/60°C temperature for PLA Pro, a 0.4mm nozzle, and 100% rectilinear infill for maximum strength. Layer heights are set at 0.20mm (or 0.15mm) for the first layer and 0.15mm for subsequent layers, with 4 wall loops. No supports are needed unless using specific "No Support" or "No Brim" versions found in the "Other" folder.

Printer Compatibility & Settings

The SFFA V3 files are compatible with most FDM 3D printers capable of handling detailed prints with high infill. Recommended materials include PLA Pro for standard use or Polymaker PA6-CF for high-temperature resilience—detailed settings for the latter are available on the creator’s Odysee channel (@s3igu2). Ensure your printer supports a 0.4mm nozzle and can maintain consistent layer heights of 0.15-0.20mm for optimal results.

Special considerations include avoiding supports unless specified and following the provided orientation of STL files for best print quality. For additional guidance, refer to the assembly animation and documentation on Odysee or the build instructions PDF linked in the file information.

Conclusion

The SFFA V3 (Select Fire Full Auto) is a groundbreaking design for advanced 3D printing and firearm enthusiasts, offering unmatched select-fire functionality with a focus on durability and precision. Due to the significant legal risks associated with machine gun configurations, users must exercise extreme caution and ensure compliance with all applicable laws. For those ready to take on this complex project, detailed resources and community support are accessible via the creator’s Odysee channel (@s3igu2).