HK Pistol Parts
- Accessories
- Magazines
HK VP
- HK VP9
- HK VP9SK
- HK VP40
MP5
- HK 94
- MP5 SD
- MP5 Clones
HK .22lr Rifles
- HK MP5
- HK 416
- GSG522
MP5K
- SP89, MP5K-N
- HK SP5K
MP5 40
- MP5 10
- MP5 .357
B&T
- Brugger & Thomet
HK 91
- HK G3
- PTR 91
- CETME, C308
- G3K, PTR PDW
HK 93
- HK 33
- HK 53
- Vector Arms V53 V93
- C93
HK MR556
- HK 416
- HK 416A5
- HK CR556
HK MR762
- HK 417
- HK MR762 LR
HK G36
- HK G36K
- HK G36C
- HK SL8
HK USC Carbine
- HK UMP 45
- HK UMP 40
- HK UMP 9mm
PSG1
- MSG90
HK 21
- HK 21E
- HK 23E
- HK 11
HK MP7, MP7A1
HK Apparel
- Shirts
- Hats
HK Aficionado
- Posters
- Stickers
- Calendars
HK Knives
- Benchmade
HK 300
- HK G41
- HK SL6
Recently Added Products
Pre-owned HK Products
Glock Magazines
AR-15, AK-47, Glock Parts
Clipped & Pinned Services
Emergency Preparedness
Browse Catalog
Gift Certificates

HK LEM Kit Complete For USP & USP Compact Pistols

SKU: HKP-00316

HK Pistol LEM Conversion Kit.

New just released from HK Germany the "universal" LEM conversion kit for USP, USPC & HK45, HK45C pistols. The New universal LEM kit also fits the recently released HK45C & HK45 Pistols. 

This kit will enable you to convert your V1-V10 HK Pistol to the LEM Conversion. Each LEM kit includes all of the parts necessary for the light LEM 4.5-5lb trigger pull. As well as the heavy LEM 7.5-8 lb. trigger pull. 

Each kit comes complete in new factory packaging & is factory fresh production direct from HK Germany.

Compatible with:

  • HK USP 9mm
  • HK USP .40
  • HK USP .45 
  • HK USP compact 9mm
  • HK USP compact .40 & .357 Sig
  • HK USP compact .45 
  • HK USP, USPC & HK45C, HK45 Tactical pistols
  • HK45C
  • HK45

Each LEM kit comes complete with the following LEM parts:

  • Hammer
  • Cocking piece
  • Hammer rebound spring
  • Light trigger return spring
  • Heavy trigger return spring
  • Hammer spring (long) for USP, USPC & HK45
  • Hammer spring (short) for the HK45C
  • Sear
  • Hammer Axle (solid)

Please note: That any pre-2005 production USP Variants will also need the new style catch part number 219442.

USP LEM & HK45 trigger pull weights quick guide:

  • Use the trigger return spring that may be in any newer production HK pistol or HK part # 209266 (black colored, thinner trigger return spring) for light LEM trigger pull, approximately 4-5 lbs.

  • Use the square spring shaped trigger return spring in the kit for the heavier LEM trigger pull, approximately 7-8 lbs.

    Developed especially for a U.S. government agency, the Law Enforcement Modification (or LEM for short), is a unique trigger mechanism created specifically to improve the trigger performance and reduce the weight of the Double-Action Only (DAO) trigger pull in the P2000SK, P2000, USP, USP Compact, HK 45, and HK 45 Compact pistols. With this mechanism, HK pistols can be fired like a standard DAO semi-automatic pistol where every round is fired by simply pulling the trigger fully rearward with the hammer starting at the forward rest position. The design of the propriety HK LEM system allows the weight of the DAO trigger pull to be reduced to a smooth and constant 7.5 - 8.5 pounds because the two-part hammer is pre-cocked every time the slide moves rearward. Or a smooth 4.5- 5.5 pounds if the operator opts for the lighter trigger pull configuration.

    Please note: The LEM kit will not work in the P2000, P2000SK, P30, P30L, VP9 & Mark 23

  • Condition: New
    Origin: German
    Sub-Type: Conversion Kit
    MPN: 260204
    Price: $149.95
    In Stock
    Save to my Wish List
    HK LEM Kit Complete For USP & USP Compact Pistols
    HK LEM Kit Complete For USP & USP Compact Pistols
    HK LEM Kit Complete For USP & USP Compact Pistols
    HK LEM Kit Complete For USP & USP Compact Pistols
    HK LEM Kit Complete For USP & USP Compact Pistols
    HK LEM Kit Complete For USP & USP Compact Pistols
    (Click to see larger image and other views)
    Previous Item   Next Item
    Related Items Others Found Useful.
    Check the check boxes next to the additional products that you would like to add to the shopping cart, then click on the "Add to Cart" button above. A check box is not shown if a product requires that you select an option or fill out a field. () indicates a required accessory.

    Product Reviews

    Write your own review


    "Outstanding Kit"

    mdhabell on 9/7/2011 3:47:05 PM

    Stars Rating:


    Comments and Suggestions: Works great in my USPc 40, no additional parts needed. If you are not sure how to install it just Google around until you find a video or a forum post that shows you how, there are several. This one kit gives you 6 different trigger options from the heavier to the feather light, try the different included springs and see what you like best. If you want a light DAO trigger this is the way to go, I highly recommend it.


    "Best upgrade for a v1 USP"

    Paul Penny on 7/7/2012 7:58:48 AM

    Stars Rating:


    Comments and Suggestions: Incredible improvement IMHO over the v1 trigger on my USPc .45. I retained the OEM trigger return spring and hammer spring for a "light LEM" configuration. Measures 1.25 lbs first stage/take-up, 5.0 lbs second stage/break. Love this on my carry USP.


    "LEM trigger"

    eric on 7/9/2012 4:43:39 PM

    Stars Rating:


    Comments and Suggestions: great improvement, liked it better than SA/DA trigger, not spongy, safety lever not in the way, can shoot tighter groups.


    "Not for older USP"

    Joseph Kautz on 5/22/2012 7:00:02 AM

    Stars Rating:


    Comments and Suggestions: My older USP9 built in 1995 wasn't compatible with this kit. Sent the gun to HK for upgrades and the LEM trigger now works fine. Can't fault the kit or HK Parts.net. I should have looked into it further before ordering. I like the trigger and am overall satisfied.


    "HK LEM Trigger for USPC 45"

    Jason Bingham on 10/22/2011 2:09:13 PM

    Stars Rating:


    Comments and Suggestions: What a great trigger group improvement, but the description said it came with everything you need. I agree with that when you're talking about hardware but it was missing directions so I had to find them on hkpro.com. I feel the $9.95 S&H was a little steep for what came in the mail, could have come Priority Mail for just $5.95. Great company and product though!!! I will purchase from hkparts.net again.


    "Charles R. Lazarus"

    Charles Lazarus on 7/1/2011 1:09:05 PM

    Stars Rating:


    Comments and Suggestions: All parts came as ordered and ina speedy time, I am very happy with the service & parts.


    "Best upgrade"

    craig freter on 12/1/2011 9:09:10 PM

    Stars Rating:


    Comments and Suggestions: I installed on my USP compact 357 sig. The LEM makes the tigger like a Glock, only better. Very smooth take up, then light clean break. Able to ride the reset like a Glock.


    "HK 45 LEM Conversion"

    Jorge Vazquez on 1/4/2012 12:58:14 AM

    Stars Rating:


    Comments and Suggestions: I absolutely love the LEM conversion. It literally makes the weapon "caveman" simple to use, which is actually a great advantage, especially for anyone who has ever or could ever be put into a life or death situation. Only downside is that this weapon is now more of a tactical piece instead of a home defense weapon. I say this for anyone who has children. Not having a safety and reducing the trigger pull to 1.5 pounds can lead to tragedies. But if you are military or L.E. then this will truly tu... More details


    "Great up grade"

    Herbert Chutter on 8/21/2012 5:55:31 AM

    Stars Rating:


    Comments and Suggestions: This kit made my usp compact 40 a pleasure to shoot compared to the var.1 trigger I replaced.The parts staff were very helpful in sorting which parts to use.Recommend highly.


    "Received quickly and love it"

    Paul Penny on 6/22/2012 11:18:04 AM

    Stars Rating:


    Comments and Suggestions: Excellent kit with all needed parts for my USPC .45. Took a little extra time to figure out all the positioning tricks first time through, but no problems and the improvement over the V1 trigger is amazing.