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It could be stuck, or there could have been something done to the gun that won't let it move. That often happens when someone replaces the cocking piece, or works on the sear or cocking piece to "improve" the trigger pull. very often that kind of work leads to sear reset failure so the rifle fires when the safety is taken off without the trigger being pulled.
If the penetrant doesn't work, and you are not knowledgeable about how that rifle works, I would advise him to take it to a gunsmith. If you mess with it and there is an accident, you could be liable for the damage.
Jim
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