FSN CIRCULAR SAW COMPATIBILITY LIST
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Can anyone provide a list of Bosch circular saws compatible with the FSN guide rail system.  I have just found out my new GKS 190 is not compatible with my FSN 1 600 Z00 00 guide rails and am not very happy.   Any information gratefully received 
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Basically, if there is a "G" after the model designation, it'll work with the FSN guide rails. For example, your saw is the GKS 190. This model (190mm blade, 65mm cut depth) is now called the GKS 65. If you want the FSN compatible model you need the GKS 65 GCE or GKS 65 G.
So FSN compatible circular saws are:
GKS 65 G/GCE
GKS 85 G
GKS 18v 57 G (cordless)
GKT 55 GCE (plunge saw)
Like yourself I was not entirely happy a few years ago when I found out my GKS 190 wasn't FSN compatible. My advice is do as I did (if it's unused), take it straight back, get you money back or get the dealer to get you an FSN compatible model. I went for the GKS 65 G initially and have now added the GKS 18v 57 G. Great saws and a joy to use with the rails.
Bob, just get design HQ to make all models guide rail compatible eh?
 
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Bosch associate
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Hi Bailey, thanks for clearing that up for Dave.

I have mentioned the idea back to the product development guys - In the future I can see all circ saws being FSN compaitible, to me it just makes sense. But this is not an overnight change that can be implimented, you'll just have to give us some time...

Bob
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i actually found a solution after research found out that my GKS 85 can be converted to GKS 85G they are basically the same i found an online spare part store and ordered what i figured to be the difference and now my saw works great on the FSN System i already had and use with my other compatible tools the conversion part were alittle pricey but i didn't mind
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Hello carmodeler. I assumed you meant you bought the 85G base for your standard 85 saw but I can't see that working properly. The G model has a different mounting bracket that sits on the base. This is so that the saw blade stays on the guide rail line even when bevelled. You can buy the bracket with the base at spare parts outlets like MTMC or powertoolspares but I'm not sure the cost of doing so makes it worth while. If you achieved it another way then I'm curious to know how. Was it an adapter (a parallel guide with appropriate slot for example)? Please post a link if so as it'll be a useful bit of kit for others I'm sure.
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yes its exactly as you said i bought both the base and the bracket in several parts and as i said it was pricey but i already had the saw and the option of returning it or exchanging it was not available and i had the FSN guide rail system  and i wanted to use it with my GKS 85 and as i remember the cost was 140 pound then and the alternative was either buy the GKS 85G which would have been significantly more money or buy the bosch old guid rail which was both not cheap and i didn't like
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Sorry to drag up an old thread, but do you have the parts you changed by any chance? 
I have a GKS85S and would also like to take advantage of the FSN systems.  I did look at the parts lists, but its not totally obvious what additional parts are required...