The Real Avid Master Extension Castle Nut Wrench is a precision armorer’s tool designed for installing and removing AR-15 buffer tube castle nuts.
- Tool Type: Castle Nut Wrench
- Platform: AR-15 / AR-10
- Fitment: Mil-Spec Castle Nuts
- Construction: Hardened Steel
- Handle: Extended Length for Leverage
- Use: Buffer Tube Installation/Removal











