When was this?
I've seen a number of M8's so equipped on this very site.
about 2-3 years, IIRC.
I'll see if I can find the email.
They told me the unit was too old and the would not be able to add an M1.
Depends on the S/N.
Mine is an M8 and one of my most dependable scopes.
Travis
You are correct, I sent one in last week for a M1 elevation upgrade, it cost $90. The Leupold person said if the serial number started with a letter or didn't start with a letter that that determined if the upgrade could be done. I don't remember which one it was, but mine was ok for the upgrade.