Guys, I've stumbled across a supply of RSM stocks, for those of you looking for a spare. They're available at Numrich online, at gunpartscorp.com. They have 2 versions, and don't do a very good job of describing them on the site. I've ordered both and returned the one that didn't work for me. My RSM is a .458 Lott, but the two they have are for ".416 Rigby Heavy Barrel" and ".375 H&H/.416 Rigby Heavy Barrel". Here are the two part numbers and descriptions: 1153530 Stock, RH, Safari Magnum, .416 Rigby, Wlnt Cut-Checkered, Satin Finish * This one is the "newer" version, for barrel band swivel stud forward of the forend. 1153540 Stock, RH, .375 H&H/.416 Rigby, Heavy Barrel, Wlnt Cut-Checkered, Satin Finish * This one is for the older version where the swivel stud comes through the forend. Search "Ruger" on left side of their homepage, then select M77 MkII Magnum. This will bring up a schematic, and the stocks are on the last page of it. Other parts can be found by looking at schematic. I don't think it's allowed to post links on AH.com so I'm trying to abide by that rule. Both are $202.20, and require rear swivel, grip cap/medallion/screws, and crossbolt to be installed (available through Numrich as well). The one I got had nicer grain than my factory stock...by the way, these are Ruger-made factory stocks. The one issue is that they appear to be made for a heavier barrel shank than my .458 Lott has. There's about a 2" long gap that will be filled in by bedding on mine. Not a huge issue to me, especially in view of the difficulty of finding these stocks! I'm attaching pics comparing the two versions listed above (taken before I returned #1153540), as well as a pic of my Lott in the stock that shows the gap I'm talking about. The one on the left in the first 2 pics is #1153530, and on the right is 1153540. The wood is obviously nicer on the 30! These are pretty dang cheap; better get one!