This is my 3rd Glock and I am losing my mind on this one. My Glock 21 - just cleaned and am attempting to reassemble the weapon. The recoil spring / guide rod will not fit. It is almost as if it is the guide rod is too long . WTF is going on? Anybody got an idea or had this happen. Have had the gun for several years, shot fine today and now this. Wanna kill these ads? We can help!