Due to loose tolerances in some manufacturers’ upper receivers, some hand fitment may be required.
- Be sure to remove 100% of any support material from the feed ramp pocket before installing
- Open feed ramp pin hole in frame 0.124″
- Drill bit: https://riptiderails.com/sd9-sr9-mac-daddy-drill-bit/
- DB9 / Mac Daddy Feed Ramp – Aluminum
- 1/8″ Solid Pin