I'll throw in a plug for Marble Arms. The sights on my Ithaca are Marbles. The rear windage and elevation screws are tiny and are very easily boogered. Marbles apparently doesn't sell direct to the public, so I sent them an e-mail asking where I could buy spare windage and elevation screws. The man wrote back and said if I gave them my address they would just send me some at no charge. I did. Yesterday, I got a half dozen of each in the mail.

Marble Arms. Another outstanding all-American company.

[Linked Image from i.imgur.com]
https://vcdl.org/