Heckler And Koch HK USP40 Compact Operators Manual

Operators Manual 
Caliber .40 S&W 
HK USP40 Compact – LEM PistolIn a world of compromise, some don’t.
®
Includes Operators
Manual Supplement
for Law Enforcement
Modification (LEM) 

SAFETY RULES
Please read this operators manual before handling your firearm. The following safety rules are placed in this manual by Heckler & Koch as an
important reminder that firearms safety is yourresponsibility. Firearms can be dangerous and can potentially cause serious injury, damage to property or
death, if handled improperly.1. Never point a firearm at anyone, or in any direction other than a SAFE direction, i.e. downrange.
2. Treat all firearms as if they are always loaded.
3. Keep your finger...

STOP! Know how to clear this pistol before attempting to operate.
Clearing the Pistol  The HK USP Pistol with Law Enforcement Modification (LEM) parts is not considered “clear”
or safe unless:
1. The magazine is removed from the pistol and;
2. The slide is locked to the rear and;
3. The chamber is free of brass or ammunition
To Clear the HK USP Pistol with LEM parts:
1. Make sure fingers are outside of the trigger guard and the pistol is pointed in a safe direction at all
times!
2. Remove magazine-...

© Heckler & Koch, Inc., 9/96, 8/97, 6/98, 6/99 (revised 8/00 w/LEM supplement) 
All rights reserved
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. 
® 

This manual applies to the Heckler & Koch USP40 Compact – LEM Pistol (Caliber .40 S&W) with 7.5-8.5 pound
double-action only trigger pull as adopted and issued to INS personnel. The illustrations show the USP40 Compact.
All USP Pistols comply with NIJ Standard – 0112.00
WARNING
A firearm has the capability of taking your life or the life of someone else! Be extremely careful with your firearm.
An accident can occur at anytime and is almost always the result of not following basic safety rules.
HK USP40...

6 TABLE OF CONTENTS
LEM Supplement   Overview ......................................................................................................................................7
Parts List  (Law Enforcement Modification) ..........................................................................................12
Exploded View (Law Enforcement Modification) ................................................................................13
Section 1...

7 The HK USP Pistol received with this supplement section
(pages 7-12) is fitted with special Double-Action Only
(DAO) trigger parts set called the “Law Enforcement
Modification”, or LEM for short. 
This supplement must be used in conjunction with the
current Operators Manual for the pistol received.  Please
review this supplement and the complete Operators
Manual for this pistol before handling the firearm. The
USP Pistol fitted with the LEM parts has the same
features and controls and is handled in the...

8
Part No. Item Description
219438 Trigger bar
215827 Assembly, recoil spring, complete 
219439 Sear, complete 
215828 Guide rod, recoil spring
219441 Spring, trigger rebound
215830 Spring, recoil
219444 Spring, cocking piece
217439 Magazine,12-round, with extended floorplate, cpl.
214695 Spring, hammer
215661 Housing, magazine, 12-round, USP40 Compact
219454 Spring, firing pin block 
219442 Catch
214212 Spring, magazine follower, 12-round, USP40 CompactOperation
USP Pistols fitted with Law Enforcement...

9 ward. When fully to the rear the cocking piece is held
in the cocked position by the sear and the hammer
spring has been fully compressed by the hammer
strut.  As the slide travels forward the hammer is
rotated back to and held in the forward position by the
hammer rebound spring. 
When the trigger is pulled rearward against the
combined force (@ 7.5 – 8.5 pounds new) of the
trigger, hammer rebound, firing pin block, and sear
springs the internal passive safeties are disengaged
and the sear releases...

10 pulling the trigger rearward you will first feel a
relatively long length of free travel (slack) and then a
second stage of heavier but consistent pull that actually
releases the hammer and fires the pistol. 
In addition to providing an improved DAO trigger pull,
the unique LEM also provides a very short trigger reset
distance to enhance the speed of multiple or follow-up
shots.
WARNING: Do not place your finger on the trigger
or within the trigger guard until you have made aconscience decision to...