WRONG. The correct number of guns in any caliber is n+1, where n is the number of guns in that which you already have.
Cracks in the stock behind the tang are a common problem with these rifles, especially in the lighter versions with skinnier stocks. The repair is obviously dependent on the severity of the crack, type of wood and the finish. Prevention usually consists of glass bedding, and shaving back the stock inlet behind the tang so that the steel doesn't make contact with the wood directly aft of the action. This stops the recoil force acting on the stock through the tang. EDIT: unless you are good with gunsmithing woodwork (are good, not just confident

) the latter is probably best left to a gunsmith.