The Glock 17 was one of the first polymer "wondernine" or high capacity semi auto pistols to garner wide spread notoriety, especially with police departments across the nation. The Glock uses a striker fired "safe action"trigger system that eliminates the need for a manual safety. The Glock pistol uses 3 different safeties that work together to operate the gun, the external trigger prevents anything except consistent rearward pressure to disable the internal firing pin block and drop safety to allow the gun to be fired. The Glock 17 Gen4 was an update to the popular polymer frame full sized duty pistol. Updated recoil spring for longer service life, and also offered interchangeable backstraps to fit the pistol to the shooters hand.The Glock 17 Gen4 also comes with a larger reversible magazine release. This Glock 17 Gen4 comes with upgraded Ameriglo Tritium Night sights for improved sight picture and low light target aquisition. The Glock 17 Gen4 comes standard with 3 17rd mags, and hard plastic carry case.