Warpspasm, You could just find a piece of closely matching walnut to use as a spacer. Or I think if you had an original buttplate you could inlet the whole thing and toss that old top piece. You would have to reshape the heel of the buttplate a little due to the stock angle. You will barely notice the 5/16 loss of length. Option 3 is to leave it as. It really doesn't look bad and is finished nicely. Overall it is a good looking rifle.