I have no qualms about buying one of Knight's bolt action rifles. In fact I just purchased a NIB SS .45 Elite from Gunbroker.
These rifles are simple to take apart.. and itseems all the basic parts like breech plugs, bolts, trigger assemblies are interchangable... regardless of caliber. For example I have1 NFPJ conversion that works in my .45 and .50 Elites... and also works in myoriginal DISC too, if Iswap the bolt.