keep in mind sf now uses an aluminum head, unless you find a very old model.
That's only for the G2L, the g2 and g3 incans come with a nitrolon head, you can switch out the aluminium head for a nitrolon head anyway, although there will be a slight drop in lumens because of the p60L's thermal regulator.Keep in mind SF now uses an aluminum head, unless you find a very old model.