Check out the many sight accessories and other gun-related products at Apertures-n-More.
I got this Sight Extension from my long-barreled 22 High Wall, as the slightly larger outer diameter gives me a better sight picture. The price was reasonable, shipping was quick and it's very well made. I like it a lot for this rifle. The other sight items on Joe's site might be helpful to others here too. I don't know him, as this was my first order, but from what I can see his site and products are worth a look (sorry, no pun intended).
Tight groups,
Old No7
