The Hornady Critical Duty .40 S&W 175 Grain FlexLock HP represents the pinnacle of law enforcement ammunition technology officially adopted by the FBI as their contracted service ammunition. This premium tactical round features Hornady's revolutionary FlexLock bullet design with patented Flex Tip technology for superior barrier penetration and consistent performance through FBI Protocol testing standards.Hornady Critical Duty .40 S&W 175 Gr FlexLock HP20 rounds per box 10 boxes per case (200 rounds total)Nickel-plated brass cases eliminate tarnish and simplify chamber checksLow-flash propellant preserves night vision in tactical situationsLarge mechanical InterLock band prevents core separation for maximum weight retentionMuzzle velocity: 1 010 fps muzzle energy: 396 ft-lbsFBI Protocol tested and officially contracted by Federal Bureau of InvestigationThe FlexLock bullet's intelligent design reacts differently depending on barriers encountered delivering consistent penetration through common urban obstacles like plywood sheet metal and auto glass. With nearly perfect weight retention (99.7%) and reliable expansion this ammunition provides law enforcement professionals and civilian defenders with uncompromising performance when it matters most.