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These weapons also generally lack any type of external safety. DAO is common among police agencies and for small, personal protection firearms. The primary drawback is that the additional trigger pull weight and travel required for each shot reduces accuracy. Pre-set triggers offer a balance of pull weight, trigger travel, safety, and consistency.
However, if a user shooting under stress short-strokes the trigger by only releasing it halfway, the trigger will reset, but with a 38 N (8.5 lb f) pull. This temporary increased trigger pull is intended to prevent negligent discharges. Double-action – firearms trigger: Pressing the trigger 1) cocks, and 2) drops the hammer. The hammer can ...
Examples of the variety of typical semi-auto mechanisms are a stiff double-action trigger pull with the safety off (Beretta 92F/FS), a double-action with no external safety (SIG Sauer P-series, or Kel-Tec P-32), or a crisp single-action trigger pull with a manual safety engaged (M1911, FN Five-seven and certain configurations of the HK USP).
The second variant, the CPX-2, eliminates the external manual safety that was featured on the CPX-1. The CPX-2 relies on the double action only (DAO) trigger pull, which requires 8.5 to 9 pounds of pressure, to help prevent unintentional discharge. A firing pin spring and low-mass hammer prevent discharge if the handgun is dropped. [2]
Same as V1, but it uses a medium Trigger Return Spring. The medium Trigger Return Spring (TRS) strikes a compromise for a cleaner trigger reset like the V2 version while providing a trigger pull weight in between V1 and V2. V4.1/CH CDA aka LEM 27.5 N (6.2 lb f) 10 mm (0.39 in)
A binary trigger (or pull and release trigger) is a type of device that allows a semi-automatic firearm to fire at an increased rate. A binary trigger works by firing one shot upon pulling the trigger and then firing a subsequent shot upon release of the trigger. Binary triggers are installed through modification of the fire-control group.
This allows for an increased rate of fire. However, the shooter must still manually pull the trigger each time it resets for any subsequent shot to be fired. An image of a forced reset trigger from ATF’s Ammunition Technology Division: Technical Bulletin 22-01. Forced reset triggers are installed through replacement of the trigger control group.
The trigger travel is 14 mm (0.55 in) long in the Anti Stress mode at approximately 20 N (4.5 lb f) trigger pull. On all subsequent shots, the P99AS is automatically pre-cocked and the trigger travel is reduced to 8 mm (0.31 in) at the same 20 N (4.5 lb f) trigger pull. For manually deactivating the Anti Stress mode and setting the pistol to ...