they go all over the place.
one day i was searching google and i decided to rifle the barrel.
i started with a .5m lenght of 20mm pvc and cut 4 diagonal slits in the end of it,
i then epoxied scalpel blades into the slots.
when the epoxy dried i slowly slid the 20mm pvc down my 40mm barrel and made sure that the blades were slicing into the barrelthen shoved it down with another lenght of pvc.
the slits are reasonably clean, after running a few golfballs through it.
and now my pool noodles go straight.
![:lol:](http://nerfhaven.com/forums/public/style_emoticons/default/laugh.gif)