05-31-2011, 12:59 PM
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co-founder
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Join Date: Mar 2005
Location: Hockeytown, USA
Posts: 9,741
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The OS version tells you everything you need to know. The "4" in the 4-1/91 means that it is a Mk4 unit. See http://www.xoutpost.com/articles/all...ystem-faq.html for more details.
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