An easy way to remember the difference between Single and Double Action is to remember that a Single Action trigger performs just a single action, dropping the hammer, which fires the round and a Double Action trigger performs two actions in one trigger pull: cocking the hammer and then releasing it.

Is a Glock a single or double action?

The Glock 19 has an overall length of 7.36 inches and a barrel length of 4.01 inches. It is a double-action pistol, meaning that after a round is chambered the pistol only requires pulling the trigger to set the firing pin and fire. Subsequent shots will also only require a single trigger pull.

Is a 9mm a single or double action?

The two guns that I use often for concealed carry are a Glock 19 and Smith & Wesson M&P 9mm. Both of these guns are double action only. This means there's no exposed hammer and that the trigger pull is the same every single time you pull the trigger. ... This means you will have a longer trigger pull for the first shot.