I've taken a LOT of Ruger Marks apart but I had one 22/45 that I finally gave up and sent to Ruger. It was either that or I was going to damage the pistol. Now it has no issues. Sometime you just gotta......my friend has two 22/45s. one is new ,the other used a little. he can not break it downto save his life !! what is the secret asnd yes he knows to push the button. HELP PLEASE