Can you shoot rifled slugs from a Remington 870 Wingmaster shotgun?

Yes you can, I own a Remington 870 wingmaster with a 27" smoothbore barrel and it shoots rifled 1oz slugs all day, and fairly accurately. The only thing you cannot shoot through it is sabbot slugs but the nice thing about having a gun like yours is that you can go from slugs to 00 buck shot to bird shot without changing barrels. Good luck and happy shooting