Smoothbore...rifled barrels take large chunks of lead out of a rifled slug..which greatly reduces accuracy...get a smoothbore barrel...they shootjust as well...i have a smoothbore that shoots groups i can cover with my fist at eighty yards...And they have more lead and weigh more...the plastic in a sabot takes up room in the barrel...trust me after eight shots with a rifled slug in a rifled barrel...u wont even see the rifling...And cleaning it is almost immpossible...Ik i tryed it once and had to boil water to soften the lead and remove it...