It's not a direct answer to your question, but have you considered a scope? With thier lack of range and recoil, you can get away with a "much" cheaper scope on a 22lr.
I have two 22.s and have Simmons "22 Mag" 4 x 32 scopes on both of them. I went with them after reading literally dozens of good reviews. They can be had for less than $40 and include a plenty good set of rings, coated optics and work great for squirrel and other small game.
If you do decide to try one, get the fixed 4x mag and steer clear of the 3-9 x 32. The variable zoom is a bit much to ask for at that price point. The 4x is much more durable.
Link..
http://www.sportsmansguide.com/net/c....aspx?a=355632