I just added a Williams peep sight that fits into the grooved receiver. Mine was $100 Canadian but they also have a much cheaper one, the WGRS 54, that would work quite well. You will need a higher front sight. I had a gunsmith cut a dovetail into the plastic front sight and mount a fiber optic sight. I just tried it out today and it is quite an improvement. I also had the had the muzzle recrowned at the same time so the improved accuracy may be partly due to that.
I do have occassional feeding problems but less than any other .22 I have had except the 10-22.
Gerry