Finding much for the 340 is going to be a challenge, wait time for Richards can be a pain.
But in the mean time....
If the stock is beat up then you have a free hand at building it in to what you want then "painting it"
Take a look over at rimefire central at what this guy did with a plain old marlin stock. scroll down to the pictures
http://www.rimfirecentral.com/forums...n+custom+stock