Recoil lug looks great. I tighten up every single recoil lug I come across, as they do come loose over long periods of time. So you may want to do that, just as a precaution. But the "crack" you have is not from a failed recoil lug. That section of the stock is not load bearing at all. Its actually just a lamination separation. You could totally ignore it, but if it makes you feel better you can carefully put some wood glue in it and clamp the stock together tell it dries. Stock will make a great shooter stock.