The RCBS Neck Expander Plug Rod (RCBS part no. 39801) is a replacement rod for use with the RCBS Neck Expander Die, sold separately. It flares only the inside dimension of the case neck rather than resizing the entire case body, which is what lets a bullet seat perfectly aligned and concentric with the case during the seating step. Keeping a spare rod on hand means a bent or worn expander rod never has to hold up a loading session.

Key Specifications

• Replacement rod for the RCBS Neck Expander Die (die sold separately).
• Flares only the inside diameter of the case neck, not the full case body.
• Leaves the rest of the case body dimensions unchanged, preserving proper chamber fit.
• Ensures the bullet seats perfectly aligned and concentric with the case neck.

Frequently Asked Questions

What die does this rod work with? The RCBS Neck Expander Die, sold separately.

What does it actually do to the case? It flares only the inside diameter of the case neck so a bullet seats concentrically, without resizing the rest of the case body.

Buy the RCBS Neck Expander Plug Rod

Keep a spare expander rod on hand so a worn part never stalls your loading session. Ships fast from our Lubbock, Texas gun shop. See our full reloading dies lineup for more RCBS die components.