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Not an expert by any stretch of the imagination, that said I would never consider
welding on any of my guns. ps

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I would try to machine the hump for the rear sight level and then cut a proper size dovetail for the sight. I am not sure who makes the sight for the Match Champion but I am sure Brownells has what you want. I have not tried it on a revolver but it worked on a Springfield semi auto at both ends.

There's a couple reasons why your getting porosity in your weld.

1st don't use any grinding wheels or wire brush used on other metals, make sure the metal is free from grease and oil
2nd make sure your using the right rod for the material your welding.
3rd don't contaminate your tungsten. This is the most common reason for porosity.

Hope this helps.

Simple answer to the OP: Yes, it can be done. No, you don't want to have it done to your gun.

Yep, If you find someone who actually does it for a "Living"...
Knowing whats critical and what is not, like most things in life, Common Sense and Experience goes along way, well and having the Right Equipment...37yrs and counting.

WOW!! That welding is 'beyond imagine' fantastic. A real pro!

Correction on "no heat treatment" on Ruger frames. Ruger cylinder frames are heat treated before machining. This includes Single-Six models. Once upon a time Ruger heat treated after machining. At some point a change was made to avoid warpage, and treatment preceded milling. Heat treatment differs between chrome-moly and stainless, and is specific to alloy.
David Bradshaw

Rubbish. Alan Harton and many others I am sure can weld stainless with relative ease and all is perfectly safe too. Though not stainless Alan filled in the topstrap, where the original rear sight sat, on the 44 Special of mine and I still have all ten fingers.

Nice, but the question was about stainless, which offers distinctly different challenges from carbon steel.

For the most part, the answer remains that stainless CAN be welded, but it's risky if you don't know what you're doing, few gunsmiths are willing to do it, few CAN do it right.

Your average corner gun mechanic won't even try.
Denis