Hello Church,,,
Okay, so double action is actually double action/single action?
You are not wrong to say that but it's not traditional,,,
DA/SA is not commonly used when speaking of a revolver,,,
DA/SA is commonly used when speaking of a semi-automatic pistol.
The term Single Action means the trigger only does one thing (it performs a single action),,,
It releases an already cocked hammer.
The term Double Action means the trigger does two things (it performs double actions),,,
It can cock the hammer and release it in one trigger pull.
In all cases a single action trigger pull is shorter in travel and lighter in effort than a double action trigger pull.
Single Action revolvers are the traditional cowboy gun:
You thumb back the hammer and then the trigger does
the single action of releasing the hammer.
Double Action revolvers are the traditional police style revolvers:
Pulling the trigger does
the two actions of cocking the hammer and releasing it to fire the cartridge.
Here is what I was referring to at the top of this post.
Double Action revolvers that have exposed hammers
could be called DA/SA,,,
Although hardly anyone ever uses that term when speaking of a revolver,,,
You can always choose to cock the hammer back manually,,,
Then pulling the trigger does one single action,,,
It releases the hammer.
DAO revolvers are ones that have a covered hammer that you can not cock manually,,,
There are also some revolvers that have the hammer spur cut away preventing you from manually cocking the hammer,,,
And there were some Double Action pistols that were initially designed or modified so that you were prevented from cocking the hammer manually.
Single Action semi-automatics are like the WW-II American 1911 pistol:
You had to cock the hammer manually by racking the slide (which also chambered the first round),,,
Or thumbing back the hammer (if there was already a live round in the chamber).
After you fire a SA semi-auto the action chambers the next round and cocks the hammer for the next shot,,,
In the SA semi-auto pistol the first and all subsequent trigger pulls are single action.
Double Action semi-auto pistols are a bit more complex to explain fully:
If the pistol has an exposed hammer it is probably a DA/SA.
That means that for the first shot you can manually cock the hammer and shoot in single action,,,
Or you may simply pull the trigger which will cock the hammer and release it,,,
All subsequent shots are then in single action mode,,,
Because the slide then cocks the hammer.
If the pistol does not have an exposed hammer it is a DAO,,,
Or striker fired (Glocks) which in practice is DAO
A DAO pistol cocks the action and fires the cartridge in one trigger pull:
The main difference between DAO and DA/SA is that a DAO
does not cock the hammer for the next shot,,,
Each time you pull the trigger on a DAO pistol it cocks the action, fires the pistol, and chambers the next cartridge for you.
I hope this makes sense and helps you.
Aarond
.