Kimber-which action is WSM?

[Mk7mmSTW]

I just bought a custom kimber Montana 325wsm. I’m having a heck of a time figuring out with Talley rings are the 30mm low. Is the WSM the 8400 or 84M action???

 

[pbroski]

Its the 8400, and it should be stamped on the left side of the receiver.

 

[t_carlson]

8400 for sure