Manual
trigger
device composed
of
the sear,
trigger
rod,
trigger
ond
trigger
spring.
breech
with
cocking handle, de
tachable
firing
pin and
extractor
.
breech nut
with
pre-stressed recoil spring.
magazine
double
line type,
holding
40 cartri
dg
es.
wooden
stock on the
MP
46
.
skeleton stock on the MP
48
(retractable).
4. Function
of
the machine pistol
When
the we
apon
is
ready to fire, the breech
is
hold
bock
by
the sear.
By
squeezing the trigger, the breech
is
freed and it
is
thrust
forward
by
the compress-
ed
recoil spring. During its
forward
motion, the breech tokes a
cartridge
from the
magazine, pu
shes
it into the chamber
and
fires it.
The
extractor
snaps over the
groove
of
the case. The pressure
of
the recoil spring
and
the inertia
of
the breech
oppose the
recoil until the
bullet
has left the barrel. Then the breech
is
pushed
rearwards. The case
is
extracted and ejected to the
right
.
When
firing
single shots
or
when
willingly
interrupting fire, the breech engages
with
the sear
in
its reormost
position.
When
the magazine
is
empty, the breech remains closed.
5. The
arrangement
of
the
magazine
A fixed
arrangement
of
the magazine has some intrinsic disadvantages:
it
hinders
when
carrying
the
weapon
and it con provoke stoppages due to
bod
feeding. A
shock on the
bottom
of
the
magazine
, when
going
down
prone
for
instance, con
jam the cartridges in the magazine.
Th
e
hinged
arrangement
of
the
magazine
allows
the
weapon
to be carried
with
a full
magazine
at
any
time and
without
an
y
danger
because it
is
set
parallel
to
the
barr
el. Thi s
arrangement
gi
ves
the soldier a r
emarkab
le
mobility
during com-
bot
. Furthermore the we
apon
is
instantly ready to fire, simp ly
by
pivoting
the
magazine
in its vertical position. The machine pistol
is
thus secure when the
magazine
is
parallel
to the barrel
or
ready
to fire when it
is
vertical.
MP
4
6. The
trigger
mechanism
Th
e type
of
fire (single shots
or
full
automatic)
is
selected
by
trigger
control,
no lever has to be moved.
By
pulling the
trigger
bock to the first
drag
point, single
shots ore fired. Full retraction
of
the tri
gger
giv
"
es
full
automatic
fire until the
trigger
is
released
or
the magazine emptied. These
two
positions
of
the
trigger
ore
clearly distinct.
7.
Safeties
a)
magazine
safety
by
pivoting
the
magazine
(see
5,
the arrangement
of
the
magazine)
.
b)
breech nut safety. A
pawl
joins the breech nut
and
the
trigger
. It locks the
trigger
if
the breech nut
is
not correctly
set.
c)
Safety
lever. A safety lever locki ng the breech con be
provided
on special
request.
8. Sights
The
weapon
is
provided
with
a rear sight
of
the drum type, it
is
graduated
for
distances
of
50,
l 00, 200 and 300
m.
Th
e
lateral
drift
of
the
bullet
is
corrected
by
the position
of
th
e rear sight notch.
9. Particularities
The particularities
of
the machine pistol con be summarized as follows :
- Lightness
-
Simple design
-
Small dimensions
-
Quick
fire-readiness and greatest safety
-
Sing le shots
or
full automatic fire by
trigger
control,
without
moving a lever
MP
5