Heckler And Koch HK USC Carbine 45 ACP Operators Manual

21
DISASSEMBLY
20USC STORAGE
NOTE: The USC is easily disassembled and reassembled with the HK
Tool. Do not use force in any of the disassembly procedures.
Disassembly beyond the procedures outlined in this manual is not
recommended and may void the HK Warranty. Disassembly beyond
the operators level described here may be carried out by qualifiedmaintenance personnel only. Contact HK for more information.
Clear the carbine! Before handling the firearm, “clear it!” Do so by:
1 • Make sure fingers are...

23
DISASSEMBLY INTO ASSEMBLY GROUPS
22USC CARBINE
Disassembly of the Bolt 
1 •Push and hold firing pin forward.
2 •Pull out firing pin assembly retaining pin to the left (Fig. 28).
3 •  Remove firing pin assembly and firing pin spring to the rear. To
do this, push the locking catch to the right (Fig. 29). With your
thumb prevent the firing pin assembly with firing pin spring from
springing out.
Fig. 28                                       Fig. 29
Pull out firing pin retaining pin    Push locking catch...

25
ASSEMBLY
24USC CARBINE
Reassembly of the USC 
1 •With the cocking lever forward, insert the bolt and recoil spring
assembly to the receiver from the rear.
2 •From below, engage lower receiver (hammer between cocked
and released positions) into the support bolts on the upper
receiver and swivel it upwards (Fig. 32).
Fig. 32
3 •Hold the upper and lower receiver firmly together. Slide buttstock
guiding rails horizontally into the appropriate slots of the lower
receiver (Fig. 33).
Fig. 33
Pushing...

27
CLEANING & MAINTENANCE
26USC CARBINE
Operator Cleaning
•The functional performance of any mechanical device varies greatly
on the quality and frequency of the maintenance performed on that
item. Firearms are no exception. The operator spends most of the time
with the weapon and therefore has the best opportunity to perform the
necessary upkeep required to insure top performance at all times.
•Metal components of new USC are coated in a thick, oily preservative
that should be removed prior to the...

29
CLEANING
28USC CARBINE
•  Chamber – Apply a liberal amount of solvent to the appropriate bore
brush. Insert the brush through the back of the receiver into the
chamber.DO NOTpush the brush past the chamber! Work the brush
back and forth in the chamber at least three times. Remove the brush
and let the solvent go to work on the fouling for a few minutes while you
work on other components.
•Chamber face– This area is easily tackled using the special Chamber
Face brush available in the HK Field Cleaning...

31
LUBRICATION
30USC CARBINE
Lubrication
Any type of high-quality, medium-weight lubricant (oil) specifically
designed for use on firearms such as Break-Free (C.L.P.) Ballistol,or
Militec will work well on the HK USC carbine.DO NOTuse
lubricants/cleaners that boast of their ability to penetrate metal (i.e.
WD-40, Tri-Flow,etc.) as these substances may deaden primers.
Where and how much? 
No Lube – (surface is dry and not slippery to the touch)
• Sling material
• Plastic components
Light Lube – (finger...

33
TROUBLESHOOTING GUIDE
32USC CARBINE
1. Put the USC safety/selector on   (Safe).
2. Remove the magazine.
3. Pull rearward on the cocking lever and lock the bolt open.
4. Ensure that barrel, cartridge chamber and receiver are free of 
obstructions.
5. Next, determine and eliminate the cause of the stoppage. The items
indicated in the following tables do not cover all stoppages
theoretically possible. A given stoppage may also have been caused
by other reasons than the ones indicated.Stoppage Cause...

35
CARRYING SLING
34USC CARBINE
Carrying sling 
The carrying sling enables the USC to be carried in several ways. The
carrying sling is attached to the mounting points on the receiver,
handstop, or buttstock via the carbine hooks.
Length Adjustment 
1 •  Close coupler 
2 •  Rest the carrying sling between thumb and index finger and let
the USC hang down in a horizontal position. Adjust the length in
such a way that there is a space of approximately 10 cm (4
inches) between your forearm and the USC.
For...

37
SIGHT ALIGNMENT
36USC CARBINE
Correct point of aim
Even circle of light
Fig. 42    Sight pictures
Point of aim
Rear sight
Aperture
Circle of light
Front sight holder
Front sight post
Impact as with incorrectly
centered front sight = right
Impact as with full sight
= highImpact as with fine sight
= low
Impact as with incorrectly
centered front sight = left
Sight Adjustment 
If the point of impact has to be corrected, this will be done by adjustment
of the rear sight using the Allen wrench provided with...

39
EXPLODED DIAGRAM & PARTS LIST
38USC CARBINE
Item Description Part No. Item Description Part No.36 Locking lever spring 214616
37 Locking lever 219095
38 Bolt 214615
39 Locking lever housing 214613
40 Elbow spring right 217946
41 Elbow spring left 205201
42 Hammer 217936
43 Hammer spring, left 217533
44 Hammer spring, right 217585
45 Notched disk 217614
46 Compression spring 205418
47 Index plate 205419
48 Axle, locking lever 219521
49 Safety lever, left 217945
50 Safety lever, right 205437
51 Magazine...