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If you pull back the spring by yourself, with an empty mag, does it locks back? If so, the gun might not be cycling fully back when the BB's fired, otherwise, if you can see trough the ejection port at the place where the little nib on the mag pushes the lock on the mag, it will give you a good idea to see if it does it's job or not.
If you insert an empty mag while looking through the port, and the lock isn't moving, make sure your mag's nib goes upper than the body of the mag, if so, take a look a the lock, it might be worn.
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