Richard,
John Martz designed (from scratch) and perfected a Luger magazine to carry .45acp cartridges. He engineered the pistol alterations around that magazine. In addition to extending the frame, the receiver rails and toggle links must be lengthened as well. He manufactures his breechblocks from scratch.
'Tuning' such a beast to function must be an art in itself.
--Dwight
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