Alx, I would expect a slower opening of the toggle and a faster closure, so the difference would be negligible. I just worked on a tired WW1 PO8 for a forum member that had a WW2 21 turn recoil spring installed and a few other minor problems. Unless everything is working properly (mag spring tention, right power ammo, smooth working extractor & poished feed ramps) the more powerful spring just causes problems. TH
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