The Glock 19 is the most popular pistol in America today. It has managed to achieve the "Goldilocks" combination of being affordable, lightweight, accurate, and packed with enough firepower to work as a mainstay "general purpose" pistol. It is pretty much the defacto American civilian handgun of choice!
Keep your Glock 19 fed with fresh OEM magazines straight from Glock! Magazines play a huge role in a pistol's reliability, so always be sure to buy quality magazines. My own experiences with cheap Korean made magazines have been... less than satisfactory.