I do have one Mauser "test stock," a total butcher job out of a battered South American railroad tie. It's pillared on both ends with a giant barrel channel, it's a great way to see if the latest milsurp or commercial pawnshop gem has any potential. If I ever do that again, I'll probably make it "adjustable" up front with a set-screw arrangement pushing on a "plate" cradling the forward part of the ring. So far it's been a good test mule, I know right away whether I've got a keeper or a tomato stake.
