Adapter replaces your stock rear sights,.. so its reversable if you dont like it...
'melt' treatment mills out the factory cut that holds your rear sight, and mills out that entire section for the sight to drop into the frame... there is no reversing this operation, or going back to original sights..
with that in mind, i had an adapter mounted optima many years ago, and sold the entire deal... I am about to melt in a docter into a g35 upper, as soon as i decide who to do it, and get the $$ squared away