HM,It sounds as though your barrel is the original 9mm one originally installed in 1914. If it has been relined to 7.65mm for some reason, it's possible that you still have the 19 turn WW1 9mm recoil spring installed. Perhaps an original 17 turn 7.65mm spring would solve your feed problems, but as mentioned above, there are many other factors that may be responcable. TH
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