Ok, here is one answer - I bought the Daisy Electronic Sight, a very cheap red dot, ($12 at WalMart), made for air guns and 22 rifles. I mounted it with the Ruger rail that came with the carbine. It works. Seriously, it works just fine. It's on the 10/22 my wife is trying to sell right now.
It's cheesy, plastic "glass", but it still works just fine, over 3 years now, IIRC.