Fn 5.7 Millimeter Pistol, Gun Used in Fort Hood               The fn 57 pistol is a semi automatic gun in 5.7×28mm manufactured by FN Herstal company. The weapon’s name refers to its 5.7 mm bullet diameter. The American Law enforcement officials have said that the  5.7 mm pistol used in the Fort Hood shooting rampage was purchased legally at a Texas gun store. The officials reportedly spoke on condition of anonymity as they are not supposed or authorized to discuss the case. Records show that Hasan bought the FN 5.7 from “Guns Galore” store in Killeen, Texas, well before the attack that killed 13 people. Gun control advocates call the pistol as a “cop killer” weapon because the gun can pierce bulletproof jackets.                             FN 5.7 millimeter pistol used by Nidal M. Hasan at Fort Hood Texas killing. There are reports that the killer who killed 13 people at Fort Hood used FN 5.7 millimeter pistol that was allegedly legally purchased by the murderer. Reports initially said that twelve people lost their lives in the macabre killing. But now the number of dead stand at 13 while the number of injured has shot up to thirty one.