Son purchased a 15rd G3 full size and I am looking at purchasing a 17rd magazine p/n 358-0021-01 for it. I am confused as to fitment as there seems to be no difference at the base of the 15 rd or 17 rd G3 when looking at them on the Taurus Arms site. Is the 17rd Taurus grip/magwell longer than the 15 rd G3? Or the pictures incorrect and there is a magazine base plate sleeve to cover the longer 17 rd magazine? Need to purchase as a gift so time is of the essence.