No special mount needed on a 91/30 (or any 91 model). Use the dovetail underneath the rear sight assembly. Remove pins that hold the assembly down and the whole rear mount will come off. Takes a good pound towards the muzzle (these are old guns), and you might have to remove a screw under the adjustable sight depending on what year it was made. Don't use rings, but buy the Leapers bi-directional 3/8 dovetail mount and it will hold a LER scope rock solid. I am going on my 4th year w/ my 91/30 and it works better than any set-up that you attach to the rear sight assembly. This past Sunday I put rounds downrange to make sure it will be ready for Deer Season, yup its fine. Had some others who wanted to shoot it, because they couldn't believe a cheap Milsurp w/ a LER would be so accurate. I have less than $100 invested in this gun and leave it at my camp for back-up, rainy days, or for those who don't have a rifle to use. Don't just take my word - Check some other forums and you will even see step by step instructions and even which Leapers mount to order and where. Gun and Game forums has a nice MN forum that explains this option and other set-ups. This does not work for the m-44, they used smaller rear sight assemblies - just the 91/30 rifle and 91/59 carbines.