I've got a 6.5-284 Lothar Walthar 28" SS barrel I'll sell for $200.00. It has less than 200 rounds down it and is a 1-8 twist. I also have a stainless barrel nut I'll throw in.
I also have 97 pieces of mostly once fired Hornady custom brass I'll sell with it for $50.
I have all the parts you are asking for I also have two barrels. I have the magazine spring, mag box, small shank barrel nut, recoil lug, trigger gaurd and have two barrels 7mm mag and 300 win mag. Shoot me a holler if you are interested.