Collectors Source tends to be over priced. Mind you, they usually only deal with high end collector stuff. However, a sniper rifle without its scope is just another No. 4 Rifle and isn't worth $4500.
Neither does " All matching numbers" guarantee that the head space is good.
Had a Savage made No. 4 Mk I* on my MIU years ago. Just another No. 4 Rifle except for the U.S. Property stamp.