I recently got a thompson center black diamond off a friend. The gun has only been fired a hand full of times. My buddy couldnt get the gun shooting a group at a close distance and said I was welcome to try and get it to shoot straight. After looking the gun over i noticed that the barrel isnt sitting snug in the stock, and when the two screws by the trigger mechinisim are seated it seems like that causes the barrel to rise off the stock. There is a hole in the stock below where the stud for sling is but nowhere on the barrel is there a threaded place for a screw to go. The only thing i can= think of is that this is the wrong stock for this gun. any input would be greatly appreciated. thanx