Silver solder requires red heat. Really bad idea. Soft solder can be used, but refinishing of the barrel would likely be necessary.
A bonding agent, like epoxy, is the best choice.
A Redman liner is 5/16 in diameter; groove diameter of the bore is .222. That leaves a wall thickness of .047. That would really require a micro weld seam to hide the liner at the muzzle, without affecting the bore.