take it from someone who learned the hard way. there is NO REASON to give raveners any kind of gun, rending claws work best since these are assault troops and the special rule for rending claws is much much better then having a ranged weapon. i had devourers on mine (for the first game i played with them) and never shot once, i promptly came home and tore off the devourers and replaced them with rending claws. ask around but i imagine that you will hear the same from other players.
like a moose,