Neil's nifty little Luger is in .45 GAP (Glock Auto Pistol), which is a Glock proprietary round with a shortened case approx. the OAL of the 9mm Parabellum, so there is no need to stretch the frame. I'm not sure if you need to hog out the mag channel a bit wider, but I do believe Neil made a new breechblock from scratch.
I understand that the .45 GAP is ballistically close enough to the standard .45 ACP that you wouldn't turn your hand for the difference.
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If it's made after 1918...it's a reproduction
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