hk usc45 User Guide
®
Operators Manual
In a world of compromise, some don’t.
HK USC Carbine
.45 ACP
USC
Universal Self-loading
Carbine
Operators Manual
CAUTION: Read the safety rules before handling the
USC Carbine!
© Heckler & Koch, Inc., 11/99 (revised June 2001)
All rights reserved
HK, Inc., 21480 Pacific Blvd.
Sterling, Virginia 20166-8903
United States of America
Telephone (703) 450-1900
Specifications and models subject to change without notice.
.45 ACP
®
5
TABLE OF CONTENTS
4
TABLE OF CONTENTS
Troubleshooting Guide ......................................................................33
Carrying Sling ....................................................................................35
Sights ..................................................................................................36
Exploded Diagram and Parts List........................................................38
Specifications ......................................................................................40
Firearms Service Record ....................................................................41
Safety Rules on the Use of the HK USC ..............................................6
General ................................................................................................8
Assembly Groups ................................................................................10
Description of Assembly Groups ........................................................11
Assembly Group 1 Upper Receiver with barrel..................................11
Assembly Group 2 Bolt Group ..........................................................12
Assembly Group 3 Lower Receiver with trigger mechanism ............13
Assembly Group 4 Buttstock with pistol grip......................................15
Assembly Group 5 Magazine ............................................................15
Accessories ........................................................................................16
Carrying Sling......................................................................................16
Cleaning Kit ........................................................................................16
Mounting Rails for Aiming Devices according to MIL-STD-1913........16
Handling and Operation ....................................................................17
Filling the Magazine ..........................................................................17
Emptying the Magazine ......................................................................17
Insertion and Removal of the Magazine ............................................17
Loading the USC ................................................................................18
Forward Assist ....................................................................................19
Storage of the USC ............................................................................20
Disassembly ........................................................................................21
Safety Check ......................................................................................21
Disassembly into Assembly Groups ..................................................23
Disassembly and Assembly of the Bolt Group....................................23
Disassembly and Assembly of the Magazine ....................................24
Reassembly of the USC ....................................................................25
Function Check ..................................................................................26
Cleaning & Maintenance ....................................................................27
Normal Cleaning ..............................................................................28
Major Cleaning ..................................................................................30
Operator Inspection ............................................................................30
Lubrication ..........................................................................................31
Ammunition..........................................................................................32
Stoppages ..........................................................................................32
7
USC SAFETY RULES
6
USC SAFETY RULES
• Before handling and cleaning the carbine check to ensure that:
- The bolt is locked to the rear
- The carbine is unloaded (cartridge chamber empty)
- The barrel is free of obstructions
- The magazine is empty.
• Keep your finger off the trigger when loading, unloading or
otherwise handling the carbine. Always place the trigger finger
outside of the trigger guard.
• Never use force when handling, disassembling, cleaning and
assembling the carbine.
• Disassemble the carbine only as far as described in this
manual.
• A handstop is provided with each USC to keep the nonfiring
hand or fingers away from the barrel of the carbine. This
handstop should be used at all times and can be mounted on
the USC with or without the mounting rails attached.
• Always wear eye protection when using the carbine.
• Always wear hearing protection when using the carbine.
• Take into account the fact that bystanders are also endangered.
Ensure bystanders are also wearing ear and eye protection.
• Only use ammunition designed to SAAMI specifications that is
factory-loaded, undamaged, and of the correct caliber. The use
of low powered cartridges (including wadcutter and semiwadcutters bullets) could lead to functional stoppages
(including bullets stuck in the barrel) and is not recommended.
• Always mind that the muzzle area is free of obstacles during
firing.
• Store the USC and ammunition in separate places.
• Discharging firearms in poorly ventilated areas, cleaning
firearms, or handling ammunition may result in exposure to
lead, a substance known to be associated with birth defects,
reproductive harm, and other serious injury. Have adequate
ventilation at all times. Wash hands thoroughly after exposure.
• Heckler & Koch does not assume liability for events due to
disregarding this manual, improper handling, negligence,
improper treatment, unauthorized exchange of parts, or
manipulations of the carbine.
• Remember, firearms safety begins with you. Read this operators
manual and be familiar with the safe handling of this firearm
before using it. Store all firearms in a safe and secure location.
Keep firearms away from children. Always be a safe shooter.
Keep this manual with the carbine.
Safety Rules on the use of the HK USC carbine.
Clear the firearm! Before handling the carbine, “clear it!” Do so by:
• Make sure fingers are outside of the trigger guard and the
weapon is pointed in a safe direction at all times!
• ON SAFE – Rotate the safety/selector lever to the “Safe”
position. (With the safety/selector lever set at the white box with
a white bullet symbol inside.)
• REMOVE MAGAZINE – Depress the magazine release lever and
remove the magazine from the magazine well.
• COCKING LEVER – Rotate the ejection port towards the ground
and pull the cocking lever rearward one or more times to insure
the chamber is empty. Watch for a live round or empty case to
be ejected. Rotate the cocking lever upward slightly and lock it
into the indent in the cocking lever housing to lock the bolt
open.
• INSPECT CHAMBER – Inspect chamber for the presence of a
live round or empty case.
Visually – View chamber through open ejection port.
Physically – Insert index finger through magazine well or
ejection port and feel for the presence of a round or cartridge
case in the chamber.
Remove any live rounds or empty cases from the chamber or
from within the firearm or magazine before handling the USC
further.
The HK USC carbine is now considered “Clear”.
WARNINGS
• Carefully read this operators manual before handling the
carbine.
• Only use the carbine after you have fully reviewed and
understand these instructions.
• Observe all notes on handling and operation. Failure to do so
may result in injury or death of the operator or bystanders.
• Do not use any firearm if you have recently ingested alcohol or
drugs.
• When passing the carbine between persons, the weapon must
be clear and the bolt should be open.
• Always treat the carbine as if it were loaded and ready to fire.
• Never point the carbine at anyone during handling.
• Always point the carbine in a safe direction.
• Place your finger on the trigger only when your sights are
aimed at the target.
9
GENERAL
8
USC CARBINE
Fig. 2 USC (right side view)
Fig. 3 USC oblique (rear, left side view)
General
The USC Carbine is a semi-automatic small arm designed and
constructed according to the latest methods of advanced technology.
The upper receiver, magazine, lower receiver, and buttstock are made of
high strength polymer. The USC is a simple blowback operated weapon
with a fixed barrel capable of semi-automatic fire.
The USC offers maximum safety and accuracy as it fires from the closed
bolt position. The USC is easily disassembled into its main assembly
groups for cleaning and care without the use of tools.
Accessories
The following accessories are available:
• mounting rails for aiming devices
• handstop
• multi-purpose carrying sling
• tactical lights
NOTE: Photographs throughout this manual show the USC carbine
with the accessory Picatinny rail mounted on the top of the upper
receiver.
Other accessories may also be available, please contact HK for more
information.
Fig. 1 USC (left side view)
11
DESCRIPTION OF ASSEMBLY GROUPS
10
USC CARBINE
Assembly Group 1 Upper receiver with barrel
The upper receiver is produced using fiber-reinforced plastics and
houses other subassemblies. The inside of the upper receiver contains
metal guideways for the bolt group as well as attachment points for the
lower receiver with magazine well and the buttstock.
The barrel is inserted into and pinned to the upper receiver. The cocking
lever of the carbine is located above the barrel. It also serves to
manually lock the bolt in its open position. The right side of the upper
receiver contains the ejection port.
The bottom part of the upper receiver includes the support bolts for the
lower receiver and a handstop with dual mounting points for the carrying
sling.
The sights are fastened to the top of the upper receiver. They consist of
a flip-up type rear sight with diopter (peep) and u-notch apertures as
well as of the front sight post with front sight hood. A Picatinny rail is
mounted on the top of the receiver. Six additional hard points are
molded into the receiver on the left, right, and on the bottom sides.
These hard points allow for the easy installation of additional rails.
Fig. 5 Upper Receiver with barrel and attachment components
1 Upper receiver 5 Flip-up rear sight
2 Barrel 6 Accessory Picatinny rail
3 Front sight 7 Handstop
4 Cocking lever 8 Hardpoints
Assembly Groups
1 Upper receiver with barrel, folding buttstock and
attachment components
2 Bolt Group with recoil spring assembly, complete
3 Lower receiver with trigger mechanism, backplate and
magazine well
4 Buttstock with pistol grip
5 Magazine
For accessories see pages 15-16
Fig. 4 USC Assembly Groups
13
DESCRIPTION OF ASSEMBLY GROUPS
Assembly Group 3 Lower receiver with trigger mechanism
The lower receiver houses the trigger mechanism with ambidextrous
safety/selector levers, the magazine well, magazine release lever and
bolt catch. The forward portion of the lower receiver is hooked to the
upper receiver. The rear portion is fastened to the upper receiver using
guide rails in the pistol grip of the buttstock.
The safety/selector levers are fitted on both sides of the pistol grip.
The forward portion of the lower receiver has lugs for attachment to the
upper receiver. Behind these lugs is the magazine well with the
magazine release lever.
Above the magazine release lever is the bolt catch. It serves to hold the
bolt rearward when the last round is fired and to release the bolt from
the open position after an empty magazine has been replaced with a
loaded magazine.The rear side of the lower receiver includes the
integrated backplate with buffer and support for the recoil spring
assembly.
Fig. 10 Lower receiver with trigger mechanism and magazine well
1 Trigger 5 Bolt catch
2 Magazine release lever 6 Safety/Selector lever
3 Magazine well 7 Hammer
4 Attachment lugs 8 Trigger guard
12
USC CARBINE
Assembly Group 2 Bolt Group
The bolt group, together with the recoil spring assembly, is contained
inside the upper receiver. The reciprocal movement of the bolt group
provides for feeding and ignition of the cartridge, for extraction and
ejection of the spent case as well as for cocking of the hammer. The
right side of the bolt has a thumb recess for manual closing of the bolt
(forward assist).
The recoil spring assembly pushes the bolt forward into the firing
position. The cone-shaped support for the recoil spring assembly is
housed in the backplate of the lower receiver. The longitudinally
movable guide ring supports itself within the bolt.
The bolt group (Fig. 8 and 9) consists of:
1 bolt 5 firing pin retaining pin
2 firing pin spring 6 recoil spring assembly, complete
3 firing pin assembly 6a guide ring
4 extractor 6b support
Fig. 8 Bolt Group, assembled
Fig. 9 Bolt Group, disassembled
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