Heckler And Koch HK UMP45, UMP40 Operators Manual

Operators Manual
In a world of compromise, some don’t.
HK UMP
Submachine Gun 
UMP45 (.45 ACP)
UMP40 (.40 S&W) 

UMP
Universal Submachine Gun
Operators Manual
CAUTION: Read the safety rules before handling the 
UMP Submachine Gun!
© Heckler & Koch, Inc., 10/1999, Revised August 2000
All rights reserved
HK, Inc., 21480 Pacific Blvd.
Sterling, Virginia 20166-8903 
United States of America
Telephone (703) 450-1900 • Fax (703) 450-8160
www.hecklerkoch-usa.com
Specifications and models subject to change without notice. 
.45 ACP
.40 S&W 

4
TABLE OF CONTENTS
Safety Rules on the Use of the HK UMP Submachine Gun ................6
General ................................................................................................8
Assembly Groups ................................................................................10
Description of Assembly Groups ........................................................11
Assembly Group 1  Upper Receiver with barrel, folding buttstock 
and attachment components  ............................11...

5
TABLE OF CONTENTS
Major Cleaning  ..................................................................................33
Operator Inspection ............................................................................34
Lubrication ..........................................................................................34
Special Use and Maintenance of HK Sound Suppressed Weapons ..35
UMP with Quick Connect Sound Suppressor  ....................................36
Ammunition...

6
UMP SAFETY RULES
Safety Rules on the use of the HK UMP Submachine Gun
Clear the weapon! Before handling the weapon, “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. See illustrations on page 12).
• REMOVE MAGAZINE – Depress the magazine release lever and
remove...

7
UMP SAFETY RULES
to fire. 
• Never point the submachine gun at anyone during handling.
• Always point the submachine gun in a safe direction. 
• Before handling and before cleaning it has to be checked to
ensure that:
- The bolt is locked to the rear
- The submachine gun 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 submachine gun. Always place the
trigger finger...

8
UMP SUBMACHINE GUN
General 
The UMP Submachine Gun is a select-fire small arm manufactured
according to the latest standards of manufacturing methods. The upper
receiver, lower receiver, magazine, and folding buttstock are made of
high strength polymer. The UMP allows single fire, limited bursts, or fully
automatic fire to be fired from all positions. The UMP is a simple
blowback operated weapon with fixed barrel. 
The UMP offers maximum safety and accuracy as it fires from the
closed bolt position.The...

9
GENERAL
Fig. 2   UMP with buttstock open, right side view
Fig. 3   UMP with buttstock folded, right side view
Fig. 4   UMP with carrying sling, left side view 

10
UMP SUBMACHINE GUN
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 Magazine 
For accessories see pages 15-16
Fig. 5 UMP Assembly Groups (4)