All those problems are within the home gunsmith's range. If you want to tackle them and need help, just ask.
Have you contacted Lyman about a replacement rail, screw and spring? Much, much cheaper than a new barrel.
Why do you want to remove the cleanout screw? Under normal maintenance, there's no reason to remove it.
Shoot the gun. If you then don't like the barrel, buy a new one. The only reason for replacing a barrel is if it doesn't shoot well.
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