I read the gunslinger series and loved it. I hated it when it ended, but I don't read a book twice. Same with movies once is enough for me. I'm not sure, but I think I have read all of King's and maybe all of Koontz' novels.
As far as a gun for Roland, I like the one King gave him. I don't know enough about different types of revolvers to notice anything wrong with it. I guess ignorance is bliss in my case.
keep on reading,
gordon.

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better have that checked