Hi. I need some help. I have a ruger charger with standard factory barrel. I want to change the stock to the ati tactical stock.What I want to know is the charger, does it have standard barrel or a bull barrel and will the charger be compatible to the ati stock. If someone could help me ill be really glad as down here in s.a we have limited acces to info as well as help. Also its the only stock available to us in s.a so if the ati doesnt work im stuffed.