In a single, when the trigger is pulled, the hammer is released, causing the cartridge in the chamber to fire. They are called “single action” because only one mechanism – the release of the hammer – occurs when the trigger is pulled in order for the gun to fire. Double-action handguns come in various forms. As the trigger is pulled on a double action only (DAO) and striker fired handguns, the hammer (or striker) is drawn back. Once the trigger has been pulled back to its "break" point, the hammer is released and dropped on the cartridge, causing it to fire. All shots are fired with the hammer initially uncocked as the hammer has no SA lock point.

Please click the green box stating it as the best answer. We are rated on our answers and are just volunteers, not Buds employees. You can choose more then one Thank you!

In double action/single action handguns, the recoiling slide automatically releases the hammer after the gun is fired. For each subsequent shot, the trigger functions as a single action. Both DA/SA pistols with exposed hammers can be fired single action whenever the shooter wants. VIDEO---youtube.com/watch?v=XJnxELSnE9g

it is similar to a glock in that the striker is pulled rearward then released when the trigger is pulled. it will not strike a second time without moving the slide to the rear a little to reset the striker.