Push in on the mag catch button as far as it will go (may need to use a plastic or nylon punch). Now on the left side of the rifle, see if you can rotate the flat portion of the mag catch 360 degrees clockwise.
It sounds like your mag catch wasn't installed properly (screwed on far enough) to engage the catchy portion of most of your clips.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.