A paintball marker includes a main body and a dual feed adapter coupled to the main body. The dual feed adapter has a hollow interior, a top feed port and a bottom feed port. A top feed storage hopper is detachably connected to the dual feed adapter at the top feed port, and a bottom feed storage magazine is detachably connected to the dual feed adapter at the bottom feed port. A sleeve with an opening is rotatable within the dual feed adapter between a first position where the sleeve opening aligns with the top feed port for feeding therethrough a first group of paintballs from the hopper, and a second position where the sleeve opening aligns with the bottom feed port for feeding therethrough a second group of paintballs from the magazine.