I ended up upgrading to a M18 circular saw and chose the aluminum Eureka zone guide rails. I did not know this when I bought the guide rails because it was not specified, but this system does not fit Milwaukee. The rails would have been expensive to ship back since the package is huge, so I chose to modify the guide rails to fit my saw. You can see in the last picture how the plastic was ground off with a die grinder. I had to grind the bottom to, which is not shown.
My recommendation is that if you own a Milwaukee saw, do not buy this. However, it is a good system if you own a different brand saw or an older corded saw. I think the least expensive track saw I saw was around 300 and this was only slightly less. If anybody does get this guide rail system, the directions have the wrong drill bit size listed for a tap, so use a tap guide for the correct drill size. Lastly, you need one transfer punch to make this perfect. (I have a full transfer punch set up to ½” but do not recall the transfer punch size). If you do not use a transfer punch, the sled will fit “ok” but it will not be a perfect fit.
Hope this write up helps. It is a good system if you own anything other than Milwaukee. Thank you for the suggestions a few months ago.