Page 56 - FAT 105 4.17 MOODLE
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Figure 26: Tilting-block rifle.
With single-shot bolt-action firearms, a • The trigger is pressed, releasing the strik-
cartridge must be fed by hand into the er and igniting the cartridge’s primer. (4)
breech. Repeating bolt-action firearms
• The bolt is manipulated once again, un-
are either fed by an internal or remov-
locking the chamber. (5)
able box magazine. The bolt is pushed
forward, driving the round into the
• As the bolt begins to travel rearward, a
chamber. Also, depending on the model,
built-in, hook-style extractor begins to pull
the actual act of feeding may happen one
the cartridge case from the chamber. (6)
of two ways: controlled or push. With a
controlled feed system, when the round • Depending on the specific model, the
is stripped from the magazine, the rim ejector may be part of the bolt head
of the cartridge slides under the claw of itself or separate as part of the receiver
the extractor and rides up the bolt face. or action. Some models feature built-in,
With a push feed system, the extractor plunger-style ejectors, which are pow-
does not grab the rim of the cartridge ered by a spring and place constant force
until it is fully seated and the chamber against the bottom edge of the cartridge
is locked. When the bolt moves forward case. Once the empty case has cleared
and strips a round from the magazine, the the ejection port, the ejector will force it
face of the bolt and extractor push the from the breech. Other models feature
round into the chamber until it is fully ejectors that are integral to the receiver
seated. When the round bottoms out in or a separate part of the action. Once the
the chamber, the extractor claw will jump bolt has reached the end of its stroke and
over the rim of the cartridge. (2) cleared the ejection port, the case will
contact the ejector and “bounce” out of
• The bolt is driven fully forward, com-
the breech. (7)
pletely seating the cartridge. Depending
on the specific model, the chamber may be • The action is now open, the chamber is
fully locked or the bolt may still need to exposed, and the firearm is ready to be
be rotated to completely lock the chamber. loaded once again.
Also, depending on the model, the striker
may be set to the cocked position. (3)
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