The accu-stock is a band-aid fix to a forearm flex problem found in the tupperwere stocks, It totaly misses the accutal problem with the stocks and that is the flex issue in the bedding/grip area. IMO the accu-stock is about as good as a tuperwere stock with the forearm reinforced. The aluminum u chanel bedding area presents a flase hope for a proper bedding area, and still needs bedded. For the additional cost you would be leaps ahead just to get a laminate stock.