Přednatažená spoušť

This is a kind of trigger and the striking-gear semi-automatic pistol. In other types of weapons used yet. Sometimes it is also often called "pre-stressed" the trigger or "trigger system with a partially předepnutým přímoběžným the firing pin".

According to some experts, this is a subset of the solely dual action trigger system (DAO), while others consider it a separate branch.

With this trigger system will occur by downloading the conclusion backward to capture přímoběžného the striker in the rear position, whereby, after pulling the trigger pulling the trigger starts on the firing pin to move backwards against the resistance of the repulsion of the spring. As soon as the mechanism reaches to a point when the parts come out of the shot, is the firing pin spring pressure thrown forward and ensure the launch of the hub.

So far, the function of the trigger system corresponds to the activities of the trigger system DAO, compared to him, however, it is not possible to the percussion mechanism to re-tension e.g. after the failure of the hub by simply chamber the shutter button, because the tension of the striker can be achieved solely by moving the conclusion of rewind.

Experts vary in opinion whether this is a advantage or not. While the DAO trigger is possible after the failure of the bullets to try chamber of the trigger to detonate the charge a second time, this trigger mechanism has to shooter cancel the aiming and manipulate with the conclusion.

Advocates of this trigger mechanism indicate that the probability of a successful shot in DAO mode after the failure of the bullets is just too low and defective shells in addition, there is a danger of abnormal development of the shot, which can cause the crash of weapons. Therefore, from their point of view more profitable by re-downloading the conclusion to throw away defective shell from the chamber and again tighten the percussion mechanism.

Generally it is the case that this type of trigger mechanism has a shorter step shutter button and its less resistance compared to a conventional DAO, although this is a weapon from the weapons can vary.

For the first time this trigger mechanism was discovered in 1980 by the gun Glock 17. Company Glock it with your gun called the Safe Action (SfA), and this name is patented.

Source:
And. E. Hartink: Encyclopedia of pistols and revolvers, publ. Rebo productions, s. r. o., Prague 1997, ISBN 80-85815-66-4
F. Novotny, And. The Kremlin, M. Helebrant: Weapons and self-defense, nakl. Goldstein & Goldstein, Prague 1997, ISBN 80-86094-23-5
Zdeněk Factor: Weapons for self-defense, nakl. Magnet-Press, Prague 1995, ISBN 80-85434-76-8

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