I found these to be myths:
1. If them barrels don't ring like London church barrels they will need rejoining. Nope, never heared them bells with any of my guns.
2. If the muzzle ends don't touch barrels could have beem cut. I don't seem to remember ever having gun that didn't have 1mm to 2mm separation. Makers tested guns for POI issues and placed wedgies so that good pattern overlap would result and that aint good for barrels touching.
3. Lever left of center means gun is badly worn, BS. What do we have with true left-handed action? Had one right hander with left of center lever and the culprit was some bad lever spring that needed replacing. The action itself was tighter then you know what.
Good luck, laddie.