Having owned both the 509 and the 45 tactical I sold the 45 simply for one reason I am not huge and it was heavy loaded and the ammo was heavy I can carry more nine than 45...... enter the 509 awesome pistol in every respect but one for me it was striker fired what I wanted was a 509 tactical but it did not exist so i sold it and got the FNx -9 single action double action now I am very happy