Topic summary
Traditional double-action
Extracted from the Wikipedia article Trigger (firearms).
Double-action/single-action
A double-action/single-action (DA/SA) trigger is a hybrid design combining the features of both single- and double-action mechanisms. It is also known as traditional double-action (TDA), as the vast majority of modern "double-action" handguns (both revolvers and semi-automatic pistols) use this type of trigger instead of "double-action only" (DAO).