Chipman stood by his call to ban popular rifles including the AR-15, which he described as “particularly lethal,” during his testimony. He said he not only supports a ban on the sale of guns but also a requirement to register currently-owned ones with the ATF. He said AR-15s and other guns should be regulated under the National Firearms Act (NFA) which would subject them to a $200 tax stamp and put the same restriction on them as those currently applied to machineguns.