Thanks for advice. I am aware that the sleeving process is different then what I mentioned. That is why, my topic subject "..Sleeving & Other Options"

@Chuck
I am in Pakistan. Your explanation in quite good and I can undertsand the amount of skill required for this job.

@Franc Otte
Quote:
sounds a bit iffy to me by your description

You got it right..sounds same to me, therefore I asked for opinions.

I took the gun to two gunsmiths in my city, one is the best and the other is just ok. Both offered the same repair which I have mentioned.

Both said that they have repaired many guns in this manner and the guns perform fine after this repair. The best guy showed me an OU repaired same way. A 6-7 inch piece at muzzle end of lower barrel was welded in same manner and joint was not visible from outside.

Both guys understand, what the proper sleeving is but cant do that because of un-availability of new barrel tubes and probably lack of expertise in barrel striking, regulating etc.

The gunsmith to whom I plan to meet is in another city and is basically a gun maker. He can sleeve barrels but to confirm his method with the standard process I have drawn steps of sleeving in following picture as I understand it from all above posts. Kindly confirm if am right?

Also mentioned what should be the critical measurements of minimum wall thickness at certain points.