It's a CS model, Carbine with Safety. Try to find a replacement forearm. The old one might be able to be filled and look OK. Probably the reason the rear one stripped is because someone put it in the Marlin "bullseye". Lots of Bubba's have done that. It's not where it goes. The Bullseye means the stock is Walnut, not Birch. Maybe you could replace the Bullseye, they are available, and put the rear swivel stud in the right place.
Good Luck, and Old Marlins are fun to work with,
Ric
