Page 128 - FAT 105 4.17 MOODLE

Figure 6: Double-action trigger function.

action) before the trigger will function. When cocked position before releasing it and firing the
the trigger is pressed, the hammer/striker will round. If the hammer/striker is cocked, pressing
move, firing the round. Depending on the ac- the trigger will simply release it.
tion type, the hammer/striker must be manually
Both trigger action types have their advantages
cocked once more or must be cocked by the ac-
and their disadvantages while performing the
tion cycling before firing again.
same basic action. The single-action trigger sys-
The double-action trigger is named so because tem tends to have the benefit of a short, light
of the fact that the trigger can perform two ac- trigger pull. This is because the hammer/striker
tions: when the trigger is pressed it can both cock is already cocked so the trigger only needs to
and release the hammer/striker (either directly move a small amount before the hammer/striker
or through some other mechanical means). This is released; the system is also much lighter for
means that the hammer/striker does not have to the same reason. Of the two styles, the single-ac-
be manually cocked before the trigger will func- tion system has a higher chance of an accidental
tion. The double-action trigger is also capable of discharge because of its pull length and weight.
functioning in a single-action mode. If the ham-
The double-action trigger system has the ben-
mer/striker is down (in the de-cocked position)
efit of being very safe and more versatile. The
when the trigger is pressed, the movement of the
pull when the hammer/striker is down tends to
trigger will drive the hammer/striker into the
be very long and heavy because the movement

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