Nice revolver, and a steal of a price. I use a 686-5 for IDPA SSR in 2-3 club matches per month.
Be advised, that was the revision (-5) at which they transitioned to the frame-mounted firing pin. If it also has a Wolff mainspring in it, test it thoroughly for reliability. I put a "full power" Wolff mainspring in my 686-5 (two of them, actually) and had light strikes on everything but Federal primers (strain screw tightened all the way down).
Some of the earlier frame mounted firing pin revolvers (of which your 686-5 is one) might be too short or too blunt to reliably work with the Wolff springs. You can try your luck with the C&S unit, or try a new factory unit if you have problems.
There's some discussion on firing pins here:
http://www.brianenos.com/forums/index.php?showtopic=65591
Personally, I went back to the OEM mainspring and it's now 100% reliable. YMMV.