they reused original springs in these kits. Check WOLF springs. Otherwise Im sure you can find a similar spring and mod it to work. Maybe use a FAL recoil spring and cut it down.
I have a PPS-43C in 7.62x25 Tokarev that I just shot for the first time today. I put 150rds of PPU 85gr FMJ down the pipe today. They all cycled fine. The ejection was to about 2:00 high and far. Does anyone make a heavier recoil spring for these? The brass cases that I can find are somewhat mangled which will require work before reloading them. I'm thinking a heavier recoil spring would solve both issues. Any options?
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