I guess what I should have asked is, is a $200.00 difference worth it to go from $899 to $1099 from 6520 to a 6920? In a local store, the 6920 had a $2000.00 price tag on it. They will always give you a better price if you challenge them on it. But still, it seems that the M4 is the more advanced way to go.
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