I had no fit problems what so ever. I recieved the barrel in the mail last night, opened up the box and slid it right into the slide. It clicked into place like it was made for it. Actually, it was made for it. LoL. A 22 model that is. I also have a 9mm barrel on the way. From what I've read and heard Glock model 22 has no problem converting to any one of the 3 calibers. You just need the right barrel. No need to change the spring although I did install a stainless steel guide rod to replace the plastic one that came with it. It sounds a lot better now. The plasic one made kind of a sqeaky noise.