Heckler And Koch HK Mark23 Operators Manual

31
Figure 11B  10-Round Civilian Magazine
(Disassembled)
10-Round Civilian Magazine (see Figure 11B)
1. Place the magazine follower onto the
magazine spring with the end of the spring
positioned on the left of the follower.
2. Insert the follower and magazine spring into
the magazine housing.
3. Place the locking insert (on 10-round
magazines) onto the protruding end of the
magazine spring so that the rounded 
corners
face towards the front of the magazine.
4. Push the locking plate down into the...

32 O-ring will now hold the muzzle tight in the
front of the slide.
3. Install the captured recoil/buffer spring
assembly into the slide so that the front of the
recoil spring guide rod engages in the smaller
hole located in the front of the slide.
4. Align the opposing angled locking surfaces of
the recoil spring guide rod with  those located
on the bottom of the barrel locking block.
5. Push the rear of the recoil/buffer spring
assembly forward enough so that the  recoil
spring retainer can be engaged...

33
 Figure 13   Correct Position for Holding Slide
for Reassembly
NOTE
Operator reassembly of the Mark 23 pistol is
now complete, but not finished without a
safety/function check.
3.5  Safety/Function Check
A. A safety/function check should be performed
anytime the pistol is reassembled. This quickcheck indicates whether or not the pistol was
properly assembled and with all the compo-
nents. A properly executed safety/function
check can also reveal many of the more obvious
malfunctions that could occur...

34 a) an empty magazine is in place.
b) the slide release is engaged (pressed
upwards).
2) The slide release does permit the slide to
snap forward when:
a) the slide release is depressed.
b) the slide is retracted without a
magazine installed.
3) The slide release does rebound with
spring pressure.
3. Perform the following safety checks:
a. Safety Lever Test.
1) With the pistol unloaded and hammer
down (uncocked) attempt to press the
safety lever upward into the safe position.
The safety lever should not...

35 times. If the hammer falls, return the
pistol to the HK Service Department for
service.
c. Decocked (hammer down) Test.
NOTE
On the Mark  23 pistol when decocked (hammer
down), the sear is engaged with the hammer at
a rebounded stop position not touching the
rear of the firing pin.
1) 
With the pistol unloaded, squeeze the
trigger allowing the hammer to cycle in the
double action mode. After the hammer
drops, retain pressure on the trigger. With
the non-firing hand apply pressure with your
finger tips...

36 3) With the pistol unloaded, pull the slide
rearward and engage the slide. Squeeze
the trigger and release the slide forward
simultaneously. Release pressure on the
trigger. If the trigger does not return to its
normal position, return the pistol to the
HK Service Department for service.
Squeeze the trigger and the hammer
should fall. If  the hammer does not fall,
return the pistol to the HK Service
Department for service.
4) With the pistol unloaded and the trigger
forward, apply thumb pressure to...

37NOTE
All parts of the HK Mark 23 can be immersed in
any cleaning solvent that it is safe to put your
hands into. Gasoline and other motor fuels are
not authorized cleaning solvents. Avoid clean-
ing the frame in an ultrasonic cleaner as this can
remove the colored “safe” and “fire” dots.
 3.8  Inspection
During and after cleaning the operator should
inspect the pistol and its components for any
irregularities that may cause problems during its
operation.  If any potential deficiencies are noted,
they...

38 5. Unaccustomed looseness
6. Parts exhibiting signs of cracks, burrs, dents,
or obvious signs of damage or stress
7. Presence of stops or tactile clicks in controls,
where applicable
8. General overall cleanliness
9. Presence of proper lubrication
10. Presence of corrosion or degradation of
      surface finish
11. Rubber hammer spur for cracks or chips
CAUTION
If the rubber hammer spur is badly cracked or
chipped, drop safety could be degraded. Pistol
should be returned to HK Service Department
to...

39 Medium Lube - (finger run across surface
yields some lube but lube does not run  down
surface when held in a vertical position)
• Barrel locking block
• Slide rails
• All operating controls
• Locking insert and guiding part
• Extractor
Heavy Lube - (Lube runs down surface when
held in a vertical position)
NOTE
No heavy lube is required on the Mark 23
pistol.
Reapply lubrication periodically during firing as it
burns off from the heat.  Apply lubricant using a
shaving brush, cotton swabs, patches, or...

40NOTE
All windage and elevation adjustments are
made using only the rear sight.
1. Windage adjustments - to adjust the
horizontal (left and right) impact of the
projectile follow these steps below:
a. Clear the Pistol!
b. Note the index mark on the rear sight and
its relationship to the index mark on the
slide.
c. Loosen the rear sight retaining screw using
a screw driver.
d. With a small hammer and brass or soft
metal drift  punch, drift the sight to the:
1) LEFT to move the point of impact to the...