Silver solder means cooking the whole thing to red heat. Doesn't appeal to me.
I have installed 9mm liners, 1/2" OD, no shoulder, with a bonding agent. No problems whatsoever.
I agree, I use Devcon Titanium Putty when I'm installing barrel sleeves. 22rf up to US30 Carbine.
Many of the original barrels used on the commercial post war Universal receivers used surplus barrels that had been cut off just after the gas piston.
Back when the M1s became restricted, non restricted barrels were difficult to come by and expensive.
I went onto the internet to check out how they did it. Universal used everything from soft solder to dual base epoxies to hold the sleeves in place.
The last 30 M1 i did has a take off match barrel sleeved into the original barrel base, from just after the gas piston port to the chamber. It shoots very well.
It's had a few thousand rounds down the bore and there is no sign of it moving at all.
It's very important to keep the liner a few thousandths smaller than drilled out inside diameter of the original barrel I also like to leave it rough, so the epoxy holds better. Same with the outside of the barrel sleeve.
The next thing is to coat both the outside of the barrel liner and the inside of the original barrel with the epoxy. This ensures no air gaps.
A good friend in Salmon Arm, sleeved a 45 caliber muzzle loader, with a sleeve that came from Track of the Wolf in the US. That was at least a decade back.
I gave him enough Devcon Titanium Putty for the job.
He had a piloted drill made up and welded length of drill rod to it.
He had to do the barrel in 12 inch runs, moving the barrel forward in the chuck until he could drill out the whole 30 inch length.
He did a good job. That old Kentucky Rifle is still shooting a few hundred shots each year.
Levon12345, very nice job. I don't think I would have attempted it myself. My hat's off to you.