After the infamous 1997 North Hollywood Shootout in Los Angeles where the bad guys were equipped with armor that stopped pistol rounds, law enforcement agencies began adopting M16s, AR-15s, and M4s as "patrol rifles." But many tactical officers stuck by the pistol-caliber subgun.
You've probably seen the Kriss Super V Vector SMG on the popular television show "Future Weapons" or perhaps read about it in Popular Science. This new submachine gun has generated a huge amount of interest because of its radically different operating system that reduces the effects of recoil and also controls muzzle climb.
Like the full-auto P90, the PS90 TR is completely ambidextrous and is blowback in operation. The gun also features a downward ejection of empty cases. But what allows the P90 and PS90 to be so effective yet lightweight is the cartridge that they fire: the 5.7 x 28mm.
The lust forautomatic weapons is now almost universal within police departments throughout the country.