But without the proper ammo it's no more then a glorified and slightly improved .22 magnum.
Ammunition
Particularly significant to the design of the Five-Seven is the 5.7x28mm cartridge created by FN for use in it. This cartridge weighs roughly half as much as a typical 9x19mm Parabellum cartridge,<19><20> allowing extra ammunition to be carried more easily. It also produces roughly 30% less recoil,<16><20> improving controllability.
One of the design intents of the SS190 variant of this cartridge (not sporting variants) was that it have the ability to penetrate Kevlar protection vests such as the NATO CRISAT vest.<16> In testing conducted by Passaic County, New Jersey Sheriff's Department, the SS190 penetrated 11 inches in bare ballistic gelatin, and penetrated 9 inches in gelatin protected with a Kevlar vest.<17> The SS190 and similar 5.7x28mm projectiles have been shown to yaw or "tumble" in testing in ballistic gelatin and other mediums,<16><17><21> using the .850 inch projectile length<9> to create a larger wound cavity. However, some are skeptical of the bullet's performance and question whether this behavior is sufficient to overcome the bullet's small diameter.<16>
Since the SS190 projectile does not rely on fragmentation or the expansion of a hollow point, FN claims the cartridge (and the Five-Seven) are suitable for military use under the Hague Conventions of 1899 and 1907, which prohibit use of expanding or fragmenting bullets in warfare.
***snip***
Controversy
* The Five-Seven and 5.7x28mm ammunition were the target of brief controversy in the United States in 2004<16> when it was claimed by the Brady Campaign that commercially available SS192 penetrated a Level IIA vest in testing.<22>
However, armor piercing variants of the 5.7x28mm are only offered to law enforcement and military customers.<23>Commercially available variants of the 5.7x28mm cartridge are classified by the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) as being not armor piercing<24> and it was claimed that the SS192 and SS196 cartridge variants did not penetrate Kevlar vests in tests conducted by FNH USA.<24> emphasis added * The Five-Seven pistol and 5.7x28mm cartridge were specifically targeted for a U.S. federal ban in 2005, which failed.<25>
http://en.wikipedia.org/wiki/FN_Five-seven As a handgun cartridge, the 5.7 round is an interesting concept. I have often recommended the .22 Winchester Magnum handgun to folks who write to me asking advice on a defensive handgun, when there are physical problems which do not allow the user to handle a cartridge with even moderate recoil, such as a .38 Special revolver or a 9mm pistol. The .22 Magnum penetrates better than a .38 Special in flesh, and the light recoil makes hitting the target repeatedly a lot easier than with a heavier-recoiling cartridge, for people who have weak hands or crippling arthritis. Even for those of us with normal strength in our hands and wrists, the .22 Magnum cartridge, fired from a hand gun, is a pretty good choice for many applications. The 5.7x28mm cartridge is very similar to the .22 Magnum cartridge in application, but offers even better performance.
http://www.gunblast.com/FN-FiveseveN.htm The United States is not Australia. The cultures are far different. If you have had success in reducing massacres in your country, then you deserve congratulations. However, firearms and firearms ownership is part of our culture and while accurate estimates are hard to come by, there are possibly 80 million handgun owners in the U.S. owing somewhere around 300 million firearms. The founding fathers of our country gave citizens the right to own firearms. At the best any effort to ban or confiscate firearms in our nation would probably result in many or most owners refusing to turn their weapons in. At the worst, such an attempt would result in enormous bloodshed and a possible civil war. It could tear our country apart.
Do rely on news stories you read about firearms as they are often biased or totally inaccurate. Do some research or ask questions in the Gungeon. The pro-gun posters spend a lot of effort to correct media stories and we provide references to back our opinions up.
Please research any stories you read that originated with the Brady Campaign. Those folks love misinformation and deceit. While they may be trying to effect positive change, they seem to believe that the end justifies the means.
(But to be fair the NRA-ILA is no paragon of virtue.)
I have no problem with those who oppose gun ownership, I just wish they would take the time to learn a little about the subject and offer a challenge to debate. (No insult intended.)