I tried to move the rear sight what a pain, I hit the sight with a punch and hammer till it finally moved and popped off. a spring and ball bearing jumped out from under the sight ( what the heck are they for ) they certainly aren't needed to hold the sight in place ! still dont know where they flew off to but I'm guessing I don't really need them anyway. but here is the kicker, the gun wont cycle rounds it jams up . I had laid the gun on its side and used two handle squeeze type bar clamps with rubber tips to the bench when I was wailing on the sight. I don't think those clamps could have deformed anything ( I hope ) but anyhow the ruger is not safe to use till I figure it . any ideas welcome ...........Wayne