ruger rsm

I have a Ruger m77 mk II express in 270 Winchester and a Ruger rsm in 375 h&h I’d like to sell. Looking for $2200 on the 270 and $2500 on the rsm included a pic of some ammo for the 375 that can go with it for an extra $175. Buyer pays actual shipping costs after I know how much it is. Thanks.

Here is a link to a Gunbroker ad. Please look at pictures 3 and 4. The serial number prefix is “M134”. Confusion or question, I was not aware of such a prefix for the Ruger RSM? I was under the impression that “780” was the earlier versions and “750” was the later ones. The Ruger Express was...

I am new here and need some help. 1. Can someone please explain in detail what is the same and what is different between the Ruger RSM generations 1, 2 and 3. 2. Please explain the 3 serial number prefixes and the start and stop dates of the prefixes. NOTE: Here is a link to Ruger on the RSM...