HK USP, HK45 Short Reset System

(6 customer reviews)


Our Short Reset System for the HK USP and HK45 replicates the short reset conversion available in our in-house custom action work. Cut from bar stock steel, these kits provide an exacting fit for easy install.

The kit shortens the reset travel distance by about one-third, reduces trigger over-travel and reduces pull weight while maintaining all factory safety functions.

This kit is specific to the HK USP and HK45 models with or without a thumb safety, including DA/SA and LEM variations. Review our Fit Guide below.

The parts provided – control latch, pin and spring – are designed to be installed together as a complete system.

In stock


This product from Grayguns replicates the the short reset conversion for HK pistols found in our custom action work in a convenient, easy to install kit. These parts are precisely wire cut EDM from ground bar stock to exacting tolerances for easy install and a precise fit. They are properly heat treated and coated in a durable nickel PTFE finish for a lifetime of durability and smooth function.

The kit is engineered to provide several benefits:

  • Shortens trigger reset travel distance by approximately 30 percent
  • Converts the action to drive the sear directly off the control latch – instead of transferring energy through the catch – for a direct drive connection between the control latch and sear
  • Reduced trigger over travel values
  • Maintains all factory safety functions
  • Simplifies install and reassembly as control latch can be installed separate from the catch. (Similar to the P30 and P2000.)
  • Works with both DA/SA and LEM variants
  • Included Grayguns Firing Pin Block Spring reduces stacking in DA pull and lightens trigger pull


The parts provided – control latch, extended sear roll pin and firing pin block spring – are designed to be installed together as a complete system.

  • Custom-designed Grayguns Control Latch
  • Custom replacement Firing Pin Block Spring
  • Custom replacement Extended Sear Roll Pin

Fit Guide

The kit works with the following DA/SA and LEM variants – with or without a thumb safety:

  • USP
  • USP Elite
  • USP Expert
  • USP Compact
  • HK45
  • HK45 Compact

Our kits will not fit the following variants:

  • Double Action Only pistols
  • MK23
  • Early USP models with joined one piece catch, control latch or models that have the short catch that stops the hammer rather than spur. These older versions are rare and usually easily identified because they lack the rubber coating on the hammer thumb stud.


These parts are intended for installation by a qualified armourer or gunsmith. In some cases professional fitting will be required by a trained, qualified armorer/gunsmith who is very familiar with the pistol’s action. This is due to the varying tolerances present in all mass-produced firearms. Although kits fit with no issues in a great majority of pistols, Grayguns is unable to guarantee perfect functionality in every instance. Grayguns does offer installation services for all parts kits we offer.

Our gunsmiths have determined a variance in some HK45/USP trigger bars. Some guns have an angle cut on the front side of the sear on the Trigger bar. We have found that installing our parts in a firearm with the extra cut will induce some issues within the gun. In Double action mode with the safety on the trigger bar allows the hammer to drop on to the catch as if it were being de-cocked. We do not recommend our parts being used with a Trigger bar that has this extra cut. However the gun will not go off in the case of the extra cut. Please consult with your local AUC/gunsmith if you do not know how to check your trigger bar.

Additional information

Weight .0625 lbs
Dimensions 6 × 4 × 1 in

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4.83 out of 5 stars

6 reviews

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5 reviews with a 5-star rating

  1. 3 out of 3 people found this helpful

    mgd675 (verified owner)

    a bit pricey, but so are a lot of precision tools, received Friday, installed, it is the BOMB, very SIG like, truly short reset and short pull, my gun has a LEM trigger, a very good investment, thanks Bruce and Company

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  2. nopointsurrender


    nopointsurrender (verified owner)

    fairly easy installation- and while I always felt my USP’s have pretty good reset, it improves it to where reset is extremely short.
    I have one in my .45 tactical and I’ll be ordering another for my 9mm compact.

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  3. userdefault

    userdefault (verified owner)

    This is a mandatory mod. I never could get 100% used to the standard LEM trigger. Mine is an HK45 with TLG light LEM setup. I’m far too used to short resets, coming from the Glock world. As much as I love HK’s and the LEM concept, I’ve just never been able to run LEM’s smoothly. This kit totally fixes that. I also bought one of these for my P30, and like it a lot as well. Interestingly, I feel like this kit on the HK45 has a few percent better trigger feel in comparison to my P30. The reset feels ever so slightly shorter than my similarly modded P30.

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  4. Jonathan Rodie

    Mandatory upgrade

    Jonathan Rodie (verified owner)

    First of all thank you to Gray Guns for checking out my trigger bar for compatibility. Shipping was fast, parts installed within a few minutes, and couldn’t be happier. Double action feels a bit smoother and the reset is not only shorter but more defined; light years ahead of stock. FYI I have a BD date code and everything works perfect. This did not work with the match TRS, trigger would not reset after double action pull. Stock TRS works just fine, hope this helps.

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  5. grammcgregor

    Exceptional Upgrade!

    grammcgregor (verified owner)

    I LOVE HK quality but prefer the Sig Short Reset Trigger actions – I found the solution!

    I installed this in my USP9C at the same time as the HK Factory Match Trigger – it was such an unbelievable improvement – I immediately ordered one for my USP9 Expert – factory match trigger was smooth with crisp break but reset wasn’t as short and consistent as I prefer. Installed the SRT and it took the trigger action to a whole new realm!! Can’t believe how short and crisp! Such an immense improvement and frankly in combination with the Match Trigger(s) – it’s absolutely incredible. Mind boggling that such a “seemingly minor part” makes such a HUGE improvement. Gray Guns MAGIC!

    Love Gray Guns Quality and Customer Service!!

    Thanks Bruce and Keith!!!!

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