As it pertains to Single Action and Double Action, these terms mostly fall into the world of hammer-fired firearms, though there are some exceptions to this rule. 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. It should be noted that in semi-automatic pistols the hammer is cocked by the recoiling slide and does not have to be manually cocked after the first shot.
Using the technical definition of Single Action, black powder rifles and muskets that predate revolvers were single-action where the shooter had to manually pull the hammer back before pulling the trigger. The shooter then has to cock the hammer to be able to fire the next round. The benefit of a single-action firearm is that the trigger pull is both light and short.
This allows you to squeeze the round off without having to exert much force through your hand which could affect your accuracy. When squeezing the trigger, movement and force should be isolated to the trigger finger.
However, some shooters take squeezing the trigger too far. Instead of squeezing the trigger with their finger, they squeeze the gun with their whole hand instead.
Squeezing the whole hand when shooting is sometimes referred to as milking and oftentimes leads to shot groups low and to the left. Now that you know what squeezing the trigger means, what does pulling the trigger mean?
And, more importantly how does it affect shot placement? When you pull a trigger you are applying force unequally to the trigger and grip of the firearm, which leads to a host of problems. Ultimately this will disrupt your sight alignment, sight picture, or both. Generally, a trigger pull is characterized by abnormal accelerated movement or pressure by the trigger finger when firing a shot. Sometimes this can lead to other unintended consequences on your grip.
Pulling the trigger aggressively also known as jerking the trigger can cause the muzzle to rise which will lead to high shot placement. Trigger press is another term floating around where trigger control is discussed but the term is sometimes confusing to new shooters. Squeeze the trigger, pull the trigger, compress the trigger. All of these are terms we often hear with trigger manipulation.
So, while it may seem an easy task, it is an important one to become good at. Otherwise, you might not be the one coming out on top in a firefight.
Your finger and trigger are one, and the only thing moving is the finger-trigger piece, not your entire hand. You can practice not anticipating the shot and jerking the trigger with ball and dummy round drills. Unfortunately, this is a very debatable topic. Also, trigger reset is only realistic for qualifications, not fight or flight mode.
So, ask yourself, how will you perform when it comes to life or death? As far as the brain and muscle memory are concerned, you have to practice something thousands and thousands of times until it becomes a subconscious act, sometimes it can even take tens of thousands of times.
When it comes down to it, removing your finger is not the concern. Instead, shooters should focus on keeping their finger in motion, which helps with something known as the death grip, the grip where your knuckles turn white. However, trigger slapping comes with both the good and bad, depending on the shooter. Trigger reset is great for the novice shooter who is learning trigger control.
It typically leads to a tighter shooting group. However, for the more advanced shooter, with self-awareness, it is quicker and easier although your shooting group will most likely be a bit wider. If you can slap the trigger without moving the muzzle of your pistol, it is then that slapping the trigger is both quick and effective. In general, single-action triggers tend to be lighter and have less travel distance than a double-action trigger.
It was largely devised and disseminated during the days when double-action revolvers were far more prevalent than semi-automatic pistols. The two-stage trigger pull was common in bullseye shooting competitions. Some people still use it for the same purpose, and it also has some other applications such as handgun hunting.
With that said, the two-stage pull doesn't work incredibly well with single-action or striker-fired pistols with short, sharp triggers.
It's not that you can't, but more that it doesn't work as well as the surprise break. Furthermore, many people feel it's unnecessary and akin to a solution in search of a problem. With practice, the surprise break is fast enough that one doesn't need to bother pausing to ensure sights are on target again before firing; the first time will do. The compressed surprise break is the trigger technique taught by Col. Jeff Cooper, more or less THE authority on all things defensive handgun shooting.
The compressed surprise break is very similar to the surprise break, though there are some subtle differences. Basically, the end game is the same: the trigger "breaks" with a smooth squeeze and the pistol discharges. However, the focus of how that happens is different. With the surprise break, one constricts the trigger until it discharges.
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