The rear receiver width of the twelve sounds like it is the same as the ten. That's not hard to believe since my ten, although a big gun, has a very trim receiver. There is another ten close to here that I will measure if I get a chance. Steven, you can see my sixteen gauge locks any time you agree to refinish the wood for me. It is solid, but dark with smooth checkering and a bit of a nick out of the forend. It needs a thin shim in the hook and there are barrel issues, but overall, it is an easy restoration. I don't normally do anything to my Lindners, but this one needs a little attention. By the way, where are John Mann's Golcher's? Were they among the guns he disposed of a short time ago? Murphy