I don't think they are marked and as far as I know they are un-changed all thru production.. It's hard to believe how much difference an fxo spring makes? But it really does? It's just that with the spot welds it just doesn't look lugerish?
best, til....lat'r....GT
BTW, Doc, hey! I need to talk to you about some more 9mm dummy rounds with a few changes if we can swing them?... drop me an email so as i can write you back!
gctomeks@msn.com best, GT