M*CARBO Brotherhood

MCARBO spring kit for FN-509 in FNS models

After watching the 509 video I took the chance on having the kit fit the FNS [ mine’s a.40 long slide] . So far so good with the slide and I believe the lower springs will work too. I’ll confirm and get back here. I got my FNS for $299 and free shipping! Some great deals out there on these in all sizes in the .40’s ! They seem to be a very solid firearm.
Hope this helps someone.