Slide?? Were you talking about blanking a dovetail in a semiauto pistol? ASIK, nobody makes that sort of an item, SS, carbon or what-have-you.
All of the items we mentioned were for a standard 3/8", 60-degree cut used on most US-made rifles, where there's a market for them due to removal of stock open irons replaced by a receiver sight or cosmetics after optics mounting.
IMO, your options on a pistol slide would boil down to having something custom made and fitted or having a truly Ace gunsmith/welder fill it in. Both are going to be costly, with the latter being seriously expensive because A: the few folks with the requisite skill and experience to do it properly charge accordingly, and B: having it done by someone else is most likely to end up costing you for both the effort and a new slide.
Out of curiousity, why?