I just got a factory Glock +2 magazine base pad that has stamped on it 1967 and no hole on the bottom for the insert. I am wondering is this +2 for a NFML magazine and will it fit FML mags. Is a extra power +10% mag. springs really needed for the mag. ext.I know it is recommended but I haven't had any issues using the stock spring with a +2 so far. All my mags are FML drop free mags.