Thought I had a problem with my Old Model Single Six when I traded for it a couple of months ago, and Customer service patiently walked me thru a check out, verifying the old gun was still fully functional. Just got rid of my last "big" pistol, and got me a cherry MKII target model that did not have any tension on the fit of the recoil spring assembly. Bing, Ruger shipped me a new one in the mail and I installed it yesterday. Took me about 5 minutes to remove the bolt, change the part, and put it back together. Like someone wrote before, once you learn how to disassemble one of the Ruger classics, you can nearly do it blind. Ruger rocks!