This has to be the very best Derringer that I have ever had the pleasure of shooting and owning and it won’t be the last one. I have a three inch barrel for the 2 1/2″ 410 / 45 Long colt, 38 / 357caliber 3 inch barrel and a 4 1/4″ barrel for 3″ 410 / 45 Long colt. You really can change these barrels in 30 seconds or less, absolutely wonderful. The driving holster has allowed me to Carry this “Hand Cannon” comfortably concealed every day.