I need info on a model 22A .22lr. It was given to me by a friend. She never used the gun, but said she bought it "years ago". Here is the serial number UAU5XXX. I would like to know what year it was made. The gun is in pristine condition. Where can I get a manual to this gun? Also, I can't rack the slide. There is an orange plastic piece that goes up and straight out on the right side of the pistol. What is this? How much does this pistol weigh? Sorry about all of the questions, but I want to understand this 22A before I shoot it. One last thing. Where can I get magazines for it? Thank you for the help.