Grayguns HK USP / HK45 Short Reset Trigger System

The HK USP and HK45 Short Reset System should be an easy installation for those familiar with the pistol’s trigger mechanism.

The control latch is precisely wire cut EDM from ground bar stock to exacting tolerances. Properly heat-treated and coated in a durable nickel PTFE finish for a lifetime of durability and smooth function.

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
• It simplifies installation and reassembly as the control latch can be installed separately 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

Parts Included in Kit

Install all parts, including the extended sear roll pin, as the parts are designed to be installed together.

• Custom-designed Grayguns Control Latch
• Custom replacement Firing Pin Block Spring
• Custom replacement Extended Sear Roll Pin
• HK USP & HK45 Short Reset System 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 a spur. These older versions are rare and usually easily identified because they lack the rubber coating on the hammer thumb stud.

Important Trigger Bar Notice

Our gunsmiths have determined variance in some HK45/USP trigger bars. Some guns have an angle cut on the front side of the sear on the trigger bar. (See photos below.)

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 onto the catch as if it were being de-cocked.

We do not recommend our parts being used with a trigger bar with this extra cut. However, the gun will not go off in the case of the extra cut. Please consult with your local gunsmith if you do not know how to check your trigger bar.