Do some research to make sure you know what to look for. A lot of "No.5's" are actually modified No.4's. Real No.5's had several weight-reduction features that No.4's don't have. A hole in the bolt, flutes milled into the barrel, something was milled off the r. side of the receiver (can't remember what it's called right now). There's other details, but someone more knowledgable will have to chime in.









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