Rhino mentioned it in the pistol class (ACT); but never went into any detail. (other than to discourage it for what we were doing at the time)
Could you remind me what I said? I've never read or heard of the term "trigger tapping," so I don't really know what you're talking about.
Okay, okay ... I just skimmed through the rest of the messages and I gather you meant "trigger slapping." That is a term I definitely use!
Some of the others have addressed this, but I'll go ahead and give my take on it.
Before I go into this, trigger slapping is nothing more than a trigger press technique. It is not bump firing, it is not shooting double taps or controlled pairs. It's just a way to work the trigger effectively.
There are two basic methods for pressing the trigger that yield good results when shooting a pistol. One is trigger slapping, and the other is "riding the trigger" aka "catching the link." I'll address riding first.
Ridin the trigger involves keeping the finger in contact with the trigger face throughout the first and all subsequent shots. After the first trigger press/fire/slide cycle, the trigger is allowed to move forward only far enough for it to rest. On guns such as Glocks, there will be a definite, very noticeable reset felt. Once the trigger resets, no more forward motion is allowed, and the next shot's trigger press starts from this position.
Catching the link works best with guns that have triggers that 1) have a noticeable reset, and 2) have a strong spring that pushes the trigger forard. Some instructors advocate using this technique no matter what kind of gun it is.
"Trigger slapping" is something that gets a bad name from people who don't understand it. The term suggests that the finger literally slaps the trigger to the rear, implying imprecise control of the trigger press. This is not true, at least when you're doing it correctly. Trigger slapping implies that the finger is allowed to move forward and lose contact with the front of the trigger, than after the trigger resets, the finger is put back in contact and pressed backward again. There is no attempt to feel or hear the trigger rest, but instead the trigger is allowed to move forward all the way.
Trigger slapping works best (or rather is the easiest to master) with gun with light, short trigger pulls and short resets. That suggest 1911s and similar guns. It's possible to do it with other guns, but it takes some practice and a little natural ability (as notasccrmom showed us).
One of the reasons why it works well for 1911s and similar guns is because the spring that pushes the trigger forward as the sear resets is weak compared to the equivalent on a Glock. This is especially true when comparing a 1911 with a good trigger job (3# or less) vs. a stock Glock trigger. If you ride the trigger, you can (usually do) slow the trigger's forward progress and prevent it from resetting as quickly as possible. Removing you finger allows it to move forward unimpeded and it will reset more quickly allowing for a faster subsequent shot.
The downside of riding the trigger is that it's difficult and sometimes impossible to feel the reset of the trigger on some guns, especially under stress. As the others mentioned, this can lead to what we call "trigger freeze," which is the trigger failing to reset before the next trigger press. Another issue is that it can lead to pinning the trigger to the rear, which can compromise accuracy if you don't know how to do it without making the gun move.
The downside of trigger slapping is that it's tough to do with some guns and most people will get better results riding the trigger on guns like Glocks with stock trigger pulls. The tendency is to not press the trigger directly rearward without disturbing the sight picture if the operator does not have enough sensitivity and control to do it. Another factor is that removing ones finger from the trigger can affect the alignment of the gun before the bullet leave the barrel. I am also skeptical that it will yield significant benefits for most shooters with factory stock guns that have strong/positive trigger resets.
The bottom line with any trigger control is pressing the trigger to the rear without disturbing the sight picture, then resetting the trigger as quickly as possible, again without disturbing the sight picture (although recoil will obvious affect it!). How it gets done will depend on the shooter and their equipment. If I didn't have a good reason to try to learn trigger slapping, I'm not sure why I would want to do it. It's the kind of detail that won't matter a lot if you master it, and it will adversely affect your marksmanship if you fail to do so.
Given that, it's how some people naturally shoot. Some do it well, others not so much.
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