Unless you're doing this as a group thing with a bunch of buddys I have to wonder "why?". You'll get a crate of rifles that all come from the same time period and quite likely from the same maker.
On the other hand if you buy them individually you can pick up examples of pre war or even each time period from the originals up to the last of them and pick up examples from the various armories. Seems to me that this would be a lot more fruitful.
....unless you simply want to be able to lift up the lid and bask in the heavy miasma of cosmoline that wafts forth.....