Page 95 - FAT 105 4.17 MOODLE

designs also feature lugs machined The locking block system utilizes a
into the slide to lock the chamber. locking block, which resides in the
frame, and a lug that is integral to the
During discharge, the pressure inside
barrel. The surfaces on the lug and the
the chamber will cause the locking
locking block are angled downward
surfaces to hold it closed until the
to drive the barrel down. When the
bullet has exited the bore and pressure
barrel begins to move back, the barrel
has dropped. The barrel will begin to
lug will cam against the locking block
move backward, driving the slide with
and be driven downward, allowing the
it. This is where the various systems
lugs on the top of the barrel to clear
begin to differ.
the lugs of the slide. The slide will
continue rearward while the barrel is
The pivoting link system relies on a
trapped by the locking block.
link that is pinned to the barrel on
one end (but moves freely) and a pin
The lug type system uses an integral
in the frame in the other. When the
lug on the bottom of the barrel to
barrel begins to move back, the pin
guide the barrel downward. A kidney-
will swing it downward, allowing the
shaped track machined into the lug
lugs on the top of the barrel and the
rides on a pin in the frame, guiding
lugs inside the slide to clear each oth-
the barrel downward as it moves back.
er. The slide will continue rearward
The slide will continue rearward
while the barrel is restrained by the
while the barrel is trapped by the
link and pin.
locking block.

Figure 16a (top) & 16b:
Locking block-type tilting barrel action.

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