I recently traded for a Survivor 308 heavy barrel gun. It shoots well, and the recoil isnt as bad as I expected. I put a black Pachmyar recoil pad on it, for the LOP more than for the recoil. Here is my question.... which barrels and stocks( Ie SB2, Handi-rifle) will work on this rifle? I am always looking at gun shows and local trades and want to know what to look for. I understand that the barrels are supposed to be installed by gunsmiths to check headspace... just wondering which models I should watch for..... Thanks in advance for any help....