yup! they are the same. if you buy a slick side upper, RRA and M&A sell the 9mm gas deflector port door kits. it will look just like colt 9mm SMG upper. you can also add the 9mm door kit to a standard .223 upper, it just looks a little odd with the large gas deflector stacked in front of the shell deflector. now that i think of it fulton armory sells a lick side upper also.