Step one. Put Detonator slide release on watch lists at all the airsoft stores that stock it.
Step two. Buy another PX4 and either take the release out or use the pistol as is.
Step three. When the part comes back into stock order it and repair the first pistol.
Step four. After the repair sell the spare pistol or keep it so you have a backup and another magazine.
Airsoft, where nothing is hurt but feelings.