An excellent upgrade over the factory sights. - XS Sight Systems DXW Big Dot Sight - S&W

I recently picked up a 3" S&W 686 Plus to put in my defensive rotation. With my eyes not being what the used to be, I found the factory red ramp sight lacking. In bright daylight, on the range, it's okay, but it still doesn't pop. I upgraded to the Big Dot sight from XS and and now I pick up the sight picture instantly! I also like the fact that it has a tritium insert for night. This is the second revolver I have XS dot sights on (I have the Standard Dot on a Ruger LCR which I also recommend). Installation isn't difficult, but it can be tricky, so take your time and be careful. For S&W revolvers, you'll need to drill the hole (#54 bit) in the front sight for the pin. I also referenced an online video for the rear sight. I'm reasonably handy with tools, so I was able to install the front and rear in about 20-30 minutes. You could probably do it faster if you're familiar with this kind of work. If you have any doubts, have a gunsmith install them for you.