At this point the most carried sidearm used by German forces was the Walther P38. A far superior weapon than the complex, expensive to manufacture, and relatively malfunction prone P-06, what most people commonly call a "Luger". Both chambered in 9 X 19 Parabellum, or more simply called 9mm Luger.
If an RAF pilot carried a sidearm it would have been the Enfield No.2 Mk I, or the No.2 Mk.I*, chambered in what the British called 380/200 (.380" diameter bullet that weighed 200 grains), and what Americans call .38 Smith & Wesson. (Note: this is not the more modern 38 Special caliber, that is actually .357" in diameter).
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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