jrh3,thank you for the heads up.Looking at the back of the mag it does indeed appear that only the base need be replaced to have 15 rnd mags instead of the 14 rnd cap. Now I need to find bases to do this.
Sure enough,they do have the same number of coils.Just checked all of my FNP-45 magazines to confirm,3=14s and 4=15s.
As I said earlier my 14s are VERY stout.Upon checking them all of mine are merely 1/4" shorter then the 15s!!
So it looks like all one needs to do to go from 14 to 15rnd is obtain a 15's base,check spring leangth,adjust(if needed,I have not tested yet),assemble and go. :shock: Bottom "window" will not match but :roll: .