Range report :
Took both my FNP Tactical and FNP USG to the range Friday and today. Ran 250 rounds through the two guns, with and without the new springs/guiderods. Both worked great, a few hangups in my tactical out of the first 2-3 magazines but none after that.....I'm calling it a break in period because after that it ran flawlessly. Comparing the with and without the new springs installed, I really believe I was getting back on target quicker with the new springs. If they reduce felt recoil it would be no more than 20% but it was noticeable. Accuracy was the same, excellent as usual.
Suppressed shooting, everything functioned fine. Again part of the initial rounds that jammed in the tactical were suppressed but that went away after 30 or so rounds. Probably put close to another 100 through it suppressed without any failures. Between the two different guns both worked great with the suppressor attached, between the two fired close to 200 rounds suppressed.
All in all I'd say these new springs work well, only time will tell how long they hold up. Forgot mention but I was strictly using the silver springs, never even tried the gold ones. Also, was shooting Tula 230gr steel cased ammo so not exactly high power ammo.