Magazine problems HELP !

[smoker]

I wrote this note to Brian and he suggested I ask the folks here for guidence. Hope you can shed some light on this for me. have a question about my Limited. I'm having trouble installing the magazine. When I push it up very carefully, the mag seems to index most of the time, and I can drop the slide to put one in the chamber. This does not always work, sometimes I cannot get the slide to go forward and the only way that I can is to push down on the mag through the open chamber, or pull on the base pad, and then I hear a click and the slide will then go forward. If I load a mag like you normally would during a match it almost always will not let the slide go forward and won't until I push down on the mag. or pull down on the base pad. Can you help me with an idea as to what to do? Thank you, smoker