I think that laser welding should produce the best result.
An alternative is to build up enough welding material using TIG or MIG welding, followed by reshaping the part using small files and a lot of patience.
I fixed the tip of a C96 bolt a couple of years ago this way. The weld blended in perfectly. I used the base of a brass cartridge as protection and filler material to allow the welding material to flow past the bolt face. Since the pistol is retired and I merely wanted to preserve the original bolt, that was good enough for me. I built up the material so that I had enough area to file down again, followed by a partial polishing of the area. The weld blended in nicely with no obvious discoloration in the material.
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