DST or Double-Set Triggers - On a rifle, a complete secondary, miniature action, which when cocked by pulling the rear trigger transforms the front trigger to a hair trigger. When the front trigger is pulled, a spring powers a miniature hammer, multiplying the force of the actual trigger pull, allowing a very light touch to accomplish the release of the main sear. While the front trigger is always at the ready (requiring a ~4 pound pull), if one has the time, using the set trigger feature may allow for a more accurate long-distance shot because now thr trigger requires only a ~4 ounce pull. To use this feature, the rear trigger must be pulled consciously just prior to taking the shot. It would be dangerous to walk with a loaded rifle having such a sensitive trigger as standard. A Double-Set trigger is normally recognizable by the small setscrew used to adjust the weight of pull required.
A Double-Set Trigger mechanism in the normal, relaxed position.
A Double-Set Trigger mechanism in the cocked position---the front trigger converted to a hair trigger. Note the tiny sear, engaged, above the front trigger.
A Double-Set Trigger operates using its own miniature firing mechanism (sear, spring and hammer) when cocked, to multiply the force of a pull on the main trigger. A pull of a few ounces then accomplishes the work that normally requires a pull of several pounds. A small setscrew located just in front of the set trigger adjusts the weight of pull of the main trigger.
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