I've got a mis-matched 1938 S/42 DDR VOPO(?) rework with a new Crown "N" barrel on it. Bore is MINT.
With the "2/1001" marked (matching) mag it functions 100 percent with South African PMP ammo (115 gr. FMJ) with rare jams using Russian 124 gr. steel cased ammo.
With the $16 unmarked SARCO repro mag it functions 100 percent with the steel-cased Russian ammo, with a rare jam using the PMP.
Using Winchester 115 gr. FMP ammo neither mag functions realiably at all --- 3-4 rounds then a jam every time.
Go figure.....
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