ORIGINAL: mobowhuntr
I'm digging deep here...But I am pretty sure it's in the 3lb 9 oz range....give or take an oz......That's pretty darn close though, if not right on.
I'm not saying your wrong but I would guess that a bare vectrix is over 4 lbs. They have a pretty beefy riser. Last year's trykon weighed 5.1 lbs bare so I'm guess a tad lighter (I would hope).
EDIT: Just looked on archerytalk and found 2 or 3 people say that it's around 4.3 lbs. Hope this helps.