I have two Mannlicher forearms that have different barrel channel dimensions. One is a "Schnabel type ,18" L., has a front end half-round dimension of .330" deep and .690" wide. The other has a straight bottom line, a vertical front end face, and is 18 1/8" L. Its forward half-round is .340" wide, .800" deep. The rear half-round is 1.00" wide and.525" deep. In order to trade or sell them I and potential buyers, would like to know which barrels they might be for. My collection isn't big enough to afford much matching. Those lengths do not include the spacers. Any help? Ken