Combat Arms
2869 Grove Way
Castro Valley, California 94546-6709
Telephone (415) 538-6544
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บ บ
บ Disassembly and Re-assembly of the Uzi 9mm/.45ACP บ
บ Carbine Trigger and Firing Mechanism บ
บ บ
บ by บ
บ บ
บ Richard M. Bash & Alvin Chu บ
บ บ
บ March 20, 1989 บ
บ บ
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1. Disassembly of the internal trigger mechanism.
a. Remove the stocks from the pistol grip.
b. Remove the open ends of the trigger spring from beneath the
trigger safety cam block. There are grooves on the bottom of the
safety cam block that the open ends fit into.
c. The grip safety must now be fully AFT. Push out the trigger axle
pin from the left to the right (as viewed from the rear). Lift
out the trigger with its attached safety cam block and the
trigger spring. The trigger spring will still be under slight
tension, so be careful.
d. Drive the sear axle pin out from left to right. Lift out the
sear, sear spring and the trip limit block. The trip limit block
points to the rear of the trigger mechanism and sits between the
sear spring coils.
e. Remove the spring from the grip safety. This completes the
disassembly.
2. Reassembly of the internal trigger group.
a. Make certain the sear spring is correctly positioned in the sear
itself. The flat side of the sear is the bottom of the sear. The
open portion of the sear points rearward. This position exposes a
hole in each of the rearward pointing "arms. Insert the ends of
the sear spring into their respective holes so that the closed
loop portion of the spring is above the two coils in the spring.
b. Seat the sear by increasing the spring tension. Do that by
pressing the closed loop against the inside front face of the
trigger housing.
c. Holding the sear and sear spring in this position, begin feeding
the sear axle pin in from the right side. The right end of the
sear axle pin has the screwdriver slot in it.
d. After positioning the sear axle pin through the rightmost sear
spring coil, set the trip limit block down between the two coils,
pointing rearward. Then push the sear axle pin on through the
trip limit block, second sear spring coil and the rest of the
sear until the pin is set flush with the outside trigger housing
surface.
e. Rotate the sear axle pin using a screwdriver until the flat face
on the sear axle pin is positioned so that the grip safety bar
will slide under the sear axle pin.
f. Position the trigger spring so that the open ends are pointing
rearward AND the straight portion connecting the two coils is
resting near the inside bottom of the trigger housing.
g. Drop the trigger into its slot in the trigger housing and between
the two coils in the spring.
h. Assure that the grip safety is positioned FULLY REARWARD and then
start pushing in the trigger axle pin with its screwdriver slot
end on the right (as viewed from the rear of the trigger
housing).
i. Push the trigger axle pin through the first coil of the trigger
spring. Hold the trigger so that the trigger axle pin may be
pushed through the trigger and the second coil. Look at the left
side of the trigger housing. Using a screwdriver of the
appropriate size, insert the screwdriver into the trigger axle
pin's slot (right end) and rotate the pin until the flat side of
the trigger axle pin is parallel to the top flat portion of the
safety bar (NOT the grip safety bar!). Then push the trigger axle
pin on through until it stops.
j. The open ends of the trigger spring must now be positioned under
the safety cam block and into the spring retaining grooves on the
underside of the safety cam block. Take your time completing this
step. A seam ripper available at any fabrics shop aids this step
or you can grind a notch in a screwdriver blade (which ruins the
screwdriver and why we recommend a seam ripper).
k. This completes the reassembly of the Uzi internal trigger
mechanism.