Well, I bought the 22/45 today. First thing I did when I got home was disassemble it just to learn how to do it. It came apart fairly easy, but wouldn't go back together at all. The hammer kept interfering with the top of the mainspring housing. I finally got it back together, but now the gun is non-functioning. And the mainspring housing won't come back out. It's been a bit of a nightmare to say the least. I'll probably be taking it to a gunsmith tomorrow.