This is common in military and some sporter Mausers if the stock isn't inletted enough behind the action.
I assume, since Turks were selling for like $50, that you didn't pay more than say $150 for this? I paid 100 for mine in similar condition.
You can never be sure when it will turn to toothpicks on you.
If I were you, this winter sometime, I would pull it out of the stock. Inlet with a dremel or scrapers a little bit around the back of the trigger guard and action where it has cracked. Enough so that when you put the gun back together, there is a gap, I would say 1/8th inch or more. Slather some poly or something on the raw wood to seal out moisture. That won't take long and will keep it from getting worse.
If you want to go the extra step, you could glass bed that part of the gun. Probably not neccesary, but it would be a good gun to learn on as you dont risk losing as much as you would on a new Remchester.
From what I've seen the Turks used very soft, pulpy wood and are more prone to these types of things.