You did what Sideshow should've done. While the Uzi is nice, it's just not a practical weapon with it's jamming rate and the 9mm ratio. These were all elements fixed by the MP7 and although it's a smaller round, hell, it's smaller overall, it'll blow right through a Kelvar helmet let alone body armor. It would've been the perfect modern upgrade for SE and it has the added advantage of still resembling the Uzi so it's not that much of a stretch.