so i received a Leatherwood malcolm long scope for my birthday and installed it myself. i am posting this for some who are thinking about getting one and how much is involved mounting one. i mounted this on my 1975 era Pedersoli rolling block. all drilling and tapping was done on a mini mill. you have to tap two 8/40 holes to mount the heavy duty recoil base.the written instructions are a little vauge and there are only a couple of pictures that don't help much. i hope this helps some.
here is the base correctly placed on the barrel before drilling holes.
here are the two holes drilled and tapped and where they need to be.
here is the base mounted to the barrel.
here's how the spring mounts on the base.
scope mount mounted on base.
anothe angle.
the rig.
right side.
left side.
also you need to smooth up the inside of the rabbit ear mount for smoother operation. i also got the finr adjustment accessory but can see i will be getting the better adjustable rear mount for $199.00 from leatherwood.HTH
Rick