I wonder if the magazine spring got put in backwards...I have an after market magazine, thing never did work correctly. I think I had the same problem with the mag catch not locking onto the lugs in the mag well. I gently filed the bottom of the two mag lugs until it snapped into the mag catch. Mine also has another problem which I can't fix. After loading six round the bullets would go nose down below the body making extraction impossible. I tried everything to make it work, no luck. It's still a six round magazine. It now resides in a drawer, possibly for eternity.