The red ramp can be removed but it's metal behind/in front of the ramp, ie. the 'red ramp is a piece that's attached to the front sight. The whole front sight is held by a pin. Given the vintage of your 686 it's probably a solid pin wheras newer 686's use a roll pin. Have you thought about a McGivern front sight? Basically, a solid front sight with a gold bead. I put one on my 5" 686 and it's the cat's meow......



























