The sheer speed with which the toggle retracts, ejects the spent case, returns to battery and takes a fresh round with it is so blindingly fast on a luger, that any slight problem with any of the parts can cause feeding problems.
The art is to get all factors working together and this usually takes a mix of magazines, ammo, various small parts and springs.
My LP08 shooter doesn't particularly like MecGars, but works well with DDR made 1001 Extruded mags. Which my S/42 doesn't like. It, however, functions flawlessly with MecGars and Sellier & Bellot 124gr ammo. In fact, all my 9mm shooters like S&B which is cheap and plentiful over here.
My KNIL Dutch prefers a spiffier 115gr and it's own old-style magazine.
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