the 6 and 6.5 both take the same feednecks and same pump handles
the major differences are....
full block vs halfblock
closed body vs open slot
6.5's get dirtier than 6's because of the open slot
the 6.5 weighs less than a 6, because there is less metal
i love halfblocks, i hate smackin myself in the face with a full block
Ryan “Super_Stanchy” Stanchfield