While a Luger is wide from toggle knob ot toggle knob, a P.38 is on the average wider because of the locking block and dual recoil springs housed in the frame. These springs are located horizontally under and on both sides of the slide. The Lugers one main recoil spring in housed vertically in the butt area making the overall width generally thinner. A Dual tone P.38 shown next to a "Jewel" of a Luger. Thor
http://boards.rennlist.com/upload/Lugertop.jpg