I bought a 552 new in the mid 70's, and to this day it's never jammed, not even one time. What's really amazing is, it sits in my barn for pest control, and it's NEVER been cleaned, not even one time since i bought it.
It looks like he!!, with the finish all cracked and weathered, but it's totally reliable, and i know when i pick it up it will go "bang" every time i pull the trigger.
DM