[mindcrime]

If we assume that every blunt object murder is a bat and every rifle murder is an assault rifle, then there are twice as many bat murders as assault rifle murders.

That assumption definitely does not hold for the technical definition of "assault rifle" which includes full-auto capability. Murders committed with fully automatic weapons are very rare, and with legally owned ones, almost completely unheard of.

Now if you use the Brady Campaign definition of "assault weapon" - which basically just translates to "scary looking gun that I don't like" then you may find different numbers.