The examples you mentioned were not methods of installing a barrel. Actually they all refered to some type or form of bedding. Manufacturing techniques have a bearing on profitability and performance. The balance of these 2 is a measure of the utility of the weapon for the task at hand. Some of the things you mentioned are accurizing processes, some designed to stop deterioration, speed/ease manufacture, or uniform performance. Some are valuable, some not. But none of what you mentioned was a way to put on a barrel.