Turners are often box-locks, they may have retailed side locks but none I can recall. I’ve weighed several Turners and most came in at 6 pounds, 3-4 ounces. There is one for sale now, but described as barrels being rough, with pitting and erosion in the bores. None that I measured were above .025”barrel walls which makes sense, to get a light gun they had to strike them thinner. But erosion and putting makes me runaway from a Turner. And this guns weighs 6 pounds 2.6 ounces. If you remove .010 from a 30” 12 bore you take away about 2 ounces. So if that gun was .025 to start with it has already lost a few thousandths. Maybe .002-.004 if it started out at exactly 6-4.

If you clean them up and remove .004-.006” that puts those barrels in the very lower limit of my comfort zone. And that assumes they are .025 now. What if they were cleaned up to .023-.021” before the most recent erosion and pitting? Then thin gets into OMG, no thin range. Pity we don’t have economical sleeve options in the US. By the way that gun is on GunBroker right now. I’m not bidding on it.