Over the years, I had several guns sleeved at gunman's shop. All turned out beautifully, especially after the time when they welded the seams. One could never tell that the barrels had been sleeved without looking at the proofmarkings. The "bluing" was top notch. Often I ordered shorter sleeve barrels than the original gun had. Say 29" or 30" to 28". This was because, just a guess, that the sleeves might have been thicker walled than the original. I was never disappointed. In one case a Lajot 12 ga had such a tiny receiver that we had to go to a 16 ga. sleeve to expect the gun to pass proof. Beautiful job.