I had a similar "stovepipe" problem with my 1917 Erfurt.
I did replace springs with new Wolff springs, but the real fix was to shift to lower power ammo.
It stovepiped with commercial 115gn, but started to run just fine with reduced power reloads (4.0gn of Titegroup behind a 115gn FMJ instead of 4.7gn).
Marc
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