An apparatus includes two halves of a rail-to-rail coupler, wherein each half carries at least one rail engagement formation comprising at least two teeth separated by at least one notch to enable engagement with a portion of a rail associated with a toy gun that incorporates at least one rail stop; and at least one passage is formed through each half that aligns with the at least one passage formed through the other of the two halves to provide a dart storage position into which a dart may be inserted when the two halves are assembled together to engage a rail associated with a toy gun.