Back in the day, I had the stainless ramp front sight on a M629-1, which was especially ugly, replaced with a blued one by MagnaPort. They milled or EDM'd the ramp off the base, EDM'd a pocket in the base and installed a standard blued red ramp and a pin. If you don't need interchangable sight capability, this is probably the way to go. All stock Smith & Wesson replacement parts are used.
"I have a 686 no dash 2 1/2" with the pinned red ramp front sight. Whats up with this one."
I don't believe that the "no dash" was made with a 2 1/2" barrel so it's probably a replacement or shortened barrel. I could be wrong and somebody will correct that statement.
Bruce