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Hello, what is the difference between the 500 and the 590 besides the barrels and mag tubes? The 590 passed the mil-spec test. Did the 500 or was it even tested? What is the difference between the 500USA and the 6-shot 590A1? Do the Mariner's have stainless steel internals? Do the other models have stainless steel internals? Are their any other differences to talk about?
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