Well I ordered and just installed the Wolf Mag springs for the 75B and 40P. I wanted to replace the 15 round springs in the Pro Mags with the Wolf. This is what I found. I got the Wolf +5 springs. It seems that the Wolf Springs are the exact same length as the Pro Mag Springs 15 rounders for the 75B. These were the springs for the full size 75B. The original factory CZ 75B mag spring is about an inch give or take longer than the Wolf and that concerned me. After I swapped them out getting that 15th round in was quite a push. I also swapped out the factory CZ spring in the 10 round CZ factory mag and ended up not using the Wolf spring in that because they were so tight.
More or less same thing happened with the 40P 12 rounders I have in Pro Mag and CZ factory. I used the Wolf Compact Springs for this. Same thing happened. The Wolf springs were the same length in the Pro Mag so I replaced them with Wolf. Again this is interesting. The original CZ 40P spring was about an inch longer than the Wolf compact spring. Again I did not replace the original CZ 40P 12 round mag spring because the rounds were so tight and the flat point lead 40 S&W rounds I was using would not load up the feed ramp.
Looks like the Wolf Mag Springs for the 75B and 40P were too tight but they were fine in the Pro Mags.?So it looks like if you want to replace the factory spring in the CZ75B 10round mag you have to go with the original CZ factory spring and in the 40P original factory 12 rounders you have to go with the factory spring and not the Wolf. ?
