For a barrel, you can look at Green Mountain Barrels, Douglas, McGowen, etc. A crossbolt is a special bolt that goes through the stock right behind the recoil lug (and sometimes another is added in front of the trigger group) to keep the stock from being split in two under recoil. It is a good thing to add to a stock on large caliber rifles.
Never try to educate someone who resists knowledge at all costs.
But what do I know?