there isn't any tool that is great for cutting a straight line except a milling machine. you make it straight afterward by sanding on a flat surface or some other similar method.
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I cut down my MI SCAR rail with a chop saw. Make sure it's a sharp blade and go slow. It's a perfectly acceptable option if you don't have access to a mill.
http://fnforum.net/forums/fn-scar-17...have-idea.html
What kind of blade? maybe I'll give it a shot.
-john
I need to cut my KMR down to 13". I will post pics of the process.