A double-action, also known as double action only (DAO) to prevent confusion with DA/SA designs, is similar to a DA revolver trigger mechanism. The trigger both cocks and releases the hammer or striker. However there is no single action function. A good example of this action is the SIG Sauer DAK trigger. For semi-automatic pistols with a traditional hammer (that employ only the double action function of the trigger), the hammer will return to its decocked position after each shot. Subsequent shots require the double action trigger firing sequence. For striker-fired pistols such as the Taurus 24/7, the striker will remain in the rest position through the entire reloading cycle. This term applies mostly to semi-automatic handguns; however, the term can also apply to some revolvers such as the Smith & Wesson Centennial, the Type 26 Revolver, and the Enfield No. 2 Mk I revolvers, in which there is no external hammer spur. Glock, Springfield XD and XDm, and Kahr semi-automatic pistols are not DA (or DAO) pistols because the striker is "cocked" to an intermediate position by the operation of the slide and they cannot be re-activated by pulling the trigger a second time.