Anyone have line on where to get these? I cannot seem to find them.

Any luck yet? I am calling Sig next week to request one, I was not aware the SRD needed one with the MPX.

All future SRD9 & SRD45's will ship with the fixed barrel spacer. If you have an older version and are in need of the spacer call Sig Sauer and they can provide one to you. Without it, you can screw up the threads.

Thank you for sharing this information, my SRD9 should be getting out of jail this month.