Have an idea project which ideally would allow me to make customize an existing ML pistol to use 2 different sized (width) barrels in 2 different calibers. Specifically using a 13/16 octagon in the channel all ready inletted for a 15/16". When i added a 1/8" cardboard shim the wedge works for both barrels height wise. Was thinking a brass shim either removable or soldered below the wood line might do it. Any suggestions? BTW still waiting on parts for the "frankenflinter" project.