What started to emerge after a year of their work, was a truly remarkable gun, with many novel and unconventional design features. The Rak was a selective fire weapon, yet the trigger had no selector lever of any kind. It fired semi-automatically when squeezed lightly, and full-automatically, if squeezed all the way back. This was pioneered as early as 1920s in the Arsenal Tallin SMG (1924), then the idea was taken over (though of fundamentally different design) in the early 1930s by the designer(s?) of the Bergmann submachine gun . The Polish design is again radically different from both Tallin, Bergmann and Czech Sa-23/26, using only the general idea of progressive trigger. Soon, in 1969 the Austrian Steyr MPi-69 joined the progressive trigger selective-fire club, but the feature still remained unique and deep-niche, until in 1977 the space-age Steyr AUG rifle made it a household idea.
Though most G/K43s are equipped with a telescopic sight mounting rail, the vast majority of the rifles were issued in their standard infantry form without a scope. When equipped with a scope, it was exclusively the ZF 4 4-power telescopic sight.  No other known scope/mount combinations were installed by the German military on G/K43's during World War II. Many strange variations have shown up after the war, but all have been proven to be the work of amateur gunsmiths. Rifles with broken-off butts are common, as German soldiers were instructed to render semi-automatic rifles useless when in danger of capture.