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Heckler And Koch HK Mark23 Operators Manual

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    							41 NOTE
    Always strike the sight on the sight base, not
    on the sight blades.
    e. Retighten the rear sight retaining screw.
    f. Confirm your battlesight zero by firing the
    pistol again.
    2. Elevation Adjustments -To adjust the vertical
    (up and down) impact of the projectile follow
    these steps below:
    a. Clear the pistol!
    b. Determine the amount of vertical change, in
    inches, that is required at 25 meters. Note
    the index mark on the rear sight and its
    relationship to the index mark on the slide.
    c. Loosen and remove the rear sight retaining
    screw using a screw driver.
    d. With a small hammer and brass or soft
    metal drift punch, drift the sight completely
    out of either side of the dovetail groove.
    e. Note the marking on the bottom of the rear
    sight. (The standard sight is unmarked),
    f. Select a higher or lower rear sight fromFigure 14.
    g. Using the brass or soft metal punch and
    hammer, install the new sight into the
    dovetail groove.
    h. Align the index marks of the rear sight and
    slide as noted in step b above.
    i. Reinstall and tighten the rear sight retaining
    screw.
    j. Confirm your battle sight zero by firing the
    pistol again.
    3.  Rear Sight Selection - The rear sight is
    marked with -6, -4, -2, unmarked, +2, +4, or +6.
    This marking represents the amount of vertical
    change, in inches, that occurs when that sight is
    exchanged with the sight originally installed in
    the pistol.
    1) To RAISE the point of impact, install a
    higher rear sight.
    2) To LOWER the point of impact, install a
    lower sight.
    Example:  The pistol is shooting 4 inches high at
    25 meters. We want the pistol to shoot dead-on
    (point of aim, point of impact). The rear sight 
    						
    							42 removed from the pistol is unmarked (standard).
    1) Figure 25 shows that the rear sight marked -4
    would lower the point of impact two increments,
    or a total of 4 inches, from the standard
    unmarked rear sight removed from the pistol.
    2) The -4 sight would be the correct one to
    install. Obtain the exchangeable rear
    sight from the kit  delivered with the
    pistols.
    Raise Point of Impact (Inches)
    Lower Point of Impact (Inches)
    -6+6
    +4
    -4-2No Marking (Standard)+2
    Figure 14
    C. Zeroing
    1. The battlesight zero of the Mark 23 pistol is set
    by the manufacturer using +P 185 grain JHP
    ammunition.  The pistol is fired from a machine
    rest at a target positioned 25 meters from thepistol.  The pistol is zeroed point of aim, point
    of impact (POA/POI).  This means the impact
    of the projectile on target will coincide with the
    point of aim of the sights at 25 meters.
    2. Each individual operator of the Mark 23 pistol
    can battlesight zero their pistol to their unique
    shooting style by adjusting the sights in
    accordance with the procedures in subpara-
    graphs 1 - 3 above. 
    						
    							43 SECTION IV - TROUBLESHOOTING PROCEDURES
     3.11  Operator Troubleshooting Procedures
    PROBLEM SYMPTOM/CAUSE REMEDY
    1. Round does not feed Fouled magazine or pistol Clean and lube pistol and magazine
    Improperly assembled Assemble correctly
    Incorrect loading procedure used Load pistol in accordance with instructions
    in operator’s manual
    Unserviceable magazine Replace magazine2. Round does not chamber Dirty or damaged magazine Clean and lube or replace magazine
    Obstruction present in chamber Remove obstruction, clean and lube
    and/or bore chamber/bore
    Bent or damaged recoil spring, Return pistol to the HK Service Depart-
    buffer spring, or guide rod. Buffer ment for service
    spring retainer roll pin drift. *
    * NOTE
    Always inspect the buffer spring retainer roll pin for drift. If not firmly seated and centered in the guide
    rod, return to the HK Service Department for replacement. 
    						
    							44 PROBLEM SYMPTOM/CAUSE REMEDY
    3. Slide does not lock Fouled barrel locking block or slide Clean and lube barrel locking block and
    fully forward slide
    Dry component parts or pistol Lubricate pistol in accordance with
    instructions in operator’s manual
    Damaged or burred slide, barrel Return pistol to the HK Service Depart-
    locking block, or recoil/buffer ment for service
    spring assembly. Buffer spring
    retainer roll pin drift. *4. Pistol does not fire Faulty ammunition Replace ammunition
    Little or no sign of firing pin strike Return pistol to the HK Service Depart-
    (indent) on primer ment for service5. Slide does not unlock Faulty ammunition, determined by Check bore for obstruction and replace
    short recoil ammunition
    Check for broken or damaged slide, Return pistol to the HK Service Depart-
    barrel locking block or recoil/buffer ment for service
    spring assembly. Buffer spring
    retainer roll pin drift. * 
    						
    							45 PROBLEM SYMPTOM/CAUSE REMEDY
    6. Cartridge does not extract Fouled chamber Clean and lube
    Ruptured cartridge case in chamber Remove ruptured case, clean and lube
    chamber
    Fouled or corroded ammunition Replace ammunition
    Pitted or damaged chamber Return pistol to the HK Service Depart-
    ment for service
    Broken or damaged extractor Return pistol to the HK Service Depart-
    or extractor spring ment for service7. Operating controls do not Damaged or improperly assembled Return pistol to the HK Service Depart-
    function as described component parts ment for service
    in operator’s manual8. Accuracy degradation Damaged or missing O-ring Replace O-ring 
    						
    							46
    Position No.        Item Description Part No.1 extractor 215707
    2 extractor spring 215708
    3 rear sight retaining screw 215711
    4 rear sight, 6.3mm standard (unmarked) 215770
    rear sight, 5.5mm (-4)* 215767
    rear sight, 5.9mm (-2)* 215768
    rear sight, 6.7mm (+2)* 215771
    rear sight, 7.1mm (+4)* 215774
    rear sight, 7.5mm (+6)* 215783
    5 front sight 215721
    6 firing pin 215705
    7 firing pin spring 215706
    8 firing pin block 215709
    9 firing pin block spring 215710
    10 firing pin retaining pin 986432
    11 extractor pin 986432
    12 slide 215667
    13 barrel 215671
    14 O-ring 986429
    15 recoil spring guide rod 215724
    16 recoil spring retainer 215725
    17 buffer spring 215726
    18 dual roll pin (buffer spring retainer) 986433
    19 buffer spring retainer 215727
    20 spring ring 929191
    21 washer 215728
    22 recoil spring 215729
    23 trigger bar, complete 215760
    24 trigger bar spring 215734
    25 c-clip (decocker) 927062
    26 decocking spring 214743
    27 decocker 215742
    28 roll pin (ejector) 986431
    29 ejector 215752
    30 sear 215748
    31 sear spring 215749
    32 sear actuator 215750
    33 disconnector 215751
    34 sear axle 21575335 roll pin (right safety lever) 986430
    36 right safety lever 215744
    37 sear block 215754
    38 decocking lockout 215745
    39 hammer axle 215738
    40 hammer, complete 215772
    41 hammer rebound spring 215739
    42 hammer strut 215740
    43 hammer strut spring 215741
    44 insert 215731
    45 locking bolt 215732
    46 frame 215976
    47 safety detent 215746
    48 safety detent spring 215747
    49 left safety lever 215769
    50 decocking lever 215766
    51 magazine release pin 986432
    52 magazine release spring 215737
    53 magazine release 215775
    54 slide release spring 215733
    55 trigger 215735
    56 trigger pin 215736
    57 slide release lever, complete 215763
    58 magazine housing (12-rd magazine) 215778
    58A magazine housing (10-rd magazine)* 215672
    59 follower (10 & 12-rd magazine) 215779
    60 locking plate (12-rd magazine) 215781
    60A locking plate (10-rd magazine)* 214853
    61 floor plate (12-rd magazine) 215780
    61A floor plate (10-rd magazine)* 215673
    62 magazine spring (12-rd magazine) 215782
    62A magazine spring (10-rd magazine)* 214821
    63 locking insert (molded into frame)
    64 trigger guard insert (molded into frame)
    65 guiding part (molded into frame)
    magazine (12-rd with LE markings), complete* 215668
    magazine (10-rd), complete* 215670
    *not pictured Position No.        Item Description Part No.
    3.12  Parts Listing for Mark 23 Pistol 
    						
    							47
    Figure 15  Exploded Diagram
       HK Mark 23 Pistol
    3 5
    4 2 1
    6 7
    8 9 11
    10
    1918
    17
    16
    15 14
    1312
    20
    21
    2223
    24
    25
    26
    2732
    283534
    33
    31
    30
    29
    40 36
    37
    3839
    48
    4746
    45
    44
    43 4241
    49 505152 53 63
    54
    55
    56
    57 58
    59 62
    60 616465 
    						
    							48
    CHAPTER 4- AMMUNITION
    The Mark 23 pistol was designed to operate best
    using two types of .45 ACP caliber ammunition.
    They are:
    A. M1911 230 grain Ball
    B. Commercially Manufactured 185 grain +P
    Jacketed Hollow Point (JHP)
    WARNING
    The use of incorrect ammunition in the pistol
    could result in damage to the pistol and/or
    injury to the operator or bystanders
    DO NOT USE
    •   Reloaded, remanufactured, or military surplus
    (foreign or outdated) ammunition
    •  Ammunition loaded in aluminum cartridge cases
    •   Cracked, split, dirty or corroded cases
    •   Ammunition assembled with corrosive primer
    and/or propellent
    •   Ammunition assembled with projectile damaged
    or pushed into cartridge case past crimp
    •   Ammunition exposed to oil, grease, water, or
    direct sunlight. Remove contaminants ifpossible before use and cool down ammunition
    exposed to direct sunlight or heat.  (Exposure to
    sources of heat could raise the chamber
    pressure of the cartridge above safe limits).
     WARNING
    Heckler & Koch specifically disclaims any re-
    sponsibilities for any damage or injury that
    should occur because of, or as a result of , the
    use of faulty, remanufactured, or reloaded
    (hand loaded) ammunition, or of cartridges
    other than those for which the pistol was origi-
    nally chambered for.
    NOTE
    If after reviewing this manual you still have
    questions, please contact your HK dealer or
    telephone the Heckler & Koch Customer
    Service Department. Please address any
    suggested changes or improvements
    concerning this manual to HK’s Creative
    Services Department. 
    						
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