I got a 1968 Rem 552 for $200 at a gunshow in January 2014
I got a 1972 Rem 552 for $220 at a gunshow in February 2014
Reducing recoil spring forcer to feed CB shorts will not work.
Get a pump 22 for that.
The Remington 550-1 is a semi auto with a segmented chamber so shorts will cycle. It will cycle a few CB shorts, and then jam.
Get a pump 22 for CB shorts in the back yard or in the garage.