I glossed over that the OP wanted to keep his same mags.. So like BP said you are stuck with a real HK91 or a clone like a PTR.. I have a PTR and a real genuine HK91 and the real HK91 is hands down a better shooter (comfort, accuracy, problems, weight, etc.) than the PTR, shooting between the two is like night and day. If you can afford one get a real HK91 you wont be disappointed.