Excellent write up. This should be stickied. Great job TooSixy!
This short guide will show you how to install the Match Trigger Kit on your USP full-size. The same guide can be used to install the kit on a USP Compact, HK45, or HK45 Compact. Note that if you are installing the kit on a compact or HK45, you will not be able to use the trigger that comes with the Match Trigger kit. In addition, there is very little room behind the trigger on the compacts so the overtravel screw does not help. To install the Match trigger on a full-size HK45, you will have to drill and tap the stock trigger to fit the overtravel stop screw, or shave down the trigger to fit. You can also send your stock trigger to Bill Springfield to have it drilled and tapped for $20. Bill will provide a stop screw with the service.
If you reside within the state of Texas and would like to perform this conversion but feel uneasy about taking apart the pistol and putting everything back together, send me a PM. I might be able to offer some assistance.
If you are installing the kit on an older model USP Compact or HK45 (date code of BB=2012 or earlier), you may not need to swap out the stock hammer spring as their stock hammer spring is the Match spring. Later models of these 2 guns no longer come with the Match hammer spring. The easiest way to tell if your gun has the Match hammer spring is to remove the magazine and look at the existing hammer spring in the magwell. If it is Blue (see pic below), you do not have the Match spring.
There are 2 different Match hammers, one is the new style with the notch on the right side of the hammer, and one without. The earlier one is designed to work with the new-style, longer catch (part #8 in the diagram below) so if you did not buy the whole complete Match Trigger Kit, make sure you get the right hammer that matches your catch.
Picture of the old-style Match hammer (left) and new-style Match hammer (right). Note the notch on the right side on the new hammer.
Photo courtesy of HKParts.net
Match Trigger Kit Parts
1. Match Trigger (215684)
2. Overtravel Stop Screw (215680)
3. Hex Wrench (958179)
4. Match TRS (215679)
5. Match Hammer (215681)
6. Nickel Plated Flat Sear Spring (215691)
7. Match Hammer Spring (215694)
8. Catch (may not need if your gun is AF or later - 219442 or 50219442)
Tools that you will need
Long needle-nose pliers
Trigger Rebound Spring (TRS) Pliers from HKParts.net (optional but strongly recommended)
Insert the stop screw on the Match trigger
To make it easier to install the screw, slave the hex wrench through the opening in the trigger and insert it into the screw.
Turn the wrench counter-clockwise to install the screw
It is important that you turn the stop screw all the way in and re-adjust it only when the installation is complete and you have verified that the hammer drops when trigger is pulled. Many people were having problem with the installation because the stop screw was not turned in all the way (e.g.: hammer does not drop when trigger is pulled because the stop screw is backed out too far)
While depressing on the lanyard block, push out the lanyard pin using the 3/32 punch
Remove the lanyard pin, lanyard block, and hammer spring
Locate the sear axle (circled in RED)
Use the 3/32 punch to push out the axle far enough so it sits flush on the frame
Remove the detent plate
Now push the sear axle all the way out to the right side of the frame
Remove the Disconnector > Catch > Control Latch > Sear (easier in that order)
1. Detent Plate
2. Sear Axle
5. Control Latch
Insert the 3/32 punch into the cavity right in front of the safety lever
While depressing on the punch (which releases tension on the slide plate), rotate the safety lever to 12-o'clock position
Pull out the safety lever
Turn the frame upside down and shake it a few times. The slide plate and compression spring should fall out
Insert the 3/32 punch into the safety lever hole and push out the hammer axle
Remove the hammer axle and hammer
Locate the Trigger Bar (right side of frame) and the Trigger Bar Detent (underneath the Trigger Bar)
When removing the trigger bar, watch the detent as it is held under tension of the detent spring
Rotate the trigger bar upward and remove it from the frame
Turn the frame upside down and the trigger bar detent should fall out
Turn the frame upside down and locate the flat spring (sear spring)
Use a small, flat-tipped screwdriver and push it against the small latch on the spring to unlock it from the frame (circled in RED)
Turn the frame around and use the needle-nose pliers to grab the spring and remove it
Grab the Nickel Plated Flat Spring with the needle-nose pliers
Insert the spring into the frame (the same spot where you had removed the stock spring in the previous step)
The next step is to swap out the stock trigger with the Match Trigger
Locate the Trigger Axle on the right side of the frame (right above the trigger, circled in RED)
Use the 1/16 punch, push the trigger axle all the way out
Grab the stock Trigger Rebound Spring (TRS) using the TRS Pliers (or long needle-nose pliers) and slowly back out the punch
Remove the TRS and trigger
Guide the Match Trigger into the opening in the frame (Did you remember to screw on the overtravel stop screw first?)
Insert the 1/16 punch into the trigger axle hole, but don't let the tip extend past the right side of the frame (to leave room for the TRS)
Use the TRS pliers and grab the Light TRS as shown in the picture
Insert the TRS so that the left leg of the spring rests upon the notch on the LEFT side of the frame, and the other leg rests squarely on the trigger
Once the TRS is correctly inserted, push the punch all the way through to the left side of the frame
Insert the Trigger Axle (from the left side) and push it in while backing out the punch slowly until the axle sits flush with the right side of the frame. The axle may not go in completely at first and may need a light tap with a punch to install it properly
Verify that the Trigger Axle sits a little below the surface on the left side of the frame (circled in RED)
Drop the Trigger Bar Detent + Spring into the hole on the frame
Install the Trigger Bar
Drop the Hammer Strut (1) into the opening in the frame (below the hammer)
Make sure it is positioned as shown in the picture
Insert the Match Hammer (2)
While depressing lightly on the Trigger Bar, insert the Hammer Axle (3)
The hammer axle should sit flush on the right side of the frame
Assemble the Slide Plate and Compression Spring as shown
Drop the Slide Plate into the cavity in front of the safety lever
Use the 3/32 punch to depress lightly on the slide plate. Make sure it clears the hammer axle hole (circled in RED)
Insert the safety lever
Insert the Sear (1), followed by Disconnector (2)
Assemble the Catch + Control Latch (3) and insert them
Slave a 3/32 punch (from the right side of the frame) through all the sear parts until it sticks out on the left side of the frame
Insert the Sear Axle (from the left side of the frame) to back out the punch to the right
Make sure the sear axle sits flush against the left side of the frame
Insert the Detent Plate and push it down until the sear axle is visible
Push the sear axle to the left until it sits flush with the RIGHT side of the frame, thus holding the detent plate in place
Drop in the Match Hammer Spring
Insert the lanyard block, making sure the hammer spring sits inside the small opening in the lanyard block (circled in RED)
While depressing on the lanyard block, insert the lanyard pin
Make sure the hammer spring is correctly positioned
Here are a couple of pictures of the Match Trigger Kit installed on a USP 9mm Custom Combat.
Match Hammer Spring on the HK45 Compact
If you are installing the Match Hammer Kit on the HK45 Compact, you will need to trim a couple of coils off the Match Hammer Spring to be the same length as the stock hammer spring.
Last edited by TooSixy; 06-06-2019 at 04:12 PM.
Excellent write up. This should be stickied. Great job TooSixy!
Far 'effing out man. Nice, I'll do it myself... I fear this will end in a fedex bag to hk...
Wow. way to go. Great pictures!
Amazing tutorial TooSixy! I followed this to the Tee, and I've learned so much (took about an hour going super slow)! I feel as if I now understand the weapon platform much better. Can't wait for the TRS so I can complete this match kit!
WRITE ANYONE WHO REPRESENTS YOU AND VOICE YOUR CONCERNS ABOUT YOUR 2ND AMENDMENT PROTECTED RIGHTS!!!
Criminals, by definition, are citizens that do not follow laws. How will a new law stop criminals from obtaining and using firearms?
Your pictorial guide to the match trigger installation is sweet, very clear and close-up pictures with step by step directions. Thank You
(pics are awesome what do you have a photo studio, how did you do the lighting ? )
Thanks for the tutorial TooSixy, it really helped. Is there any way you can take more detailed pics of the four pieces including the sear being put back together. I figured it out on my own when I installed my match kit last night into my USP but I wouldn't have done it as quickly if I didn't have a second USP to look at to see how all the pieces came together.
Last edited by kabob; 12-28-2012 at 02:28 PM.
Will see what I can do. I hate to take the gun apart just to snap a couple of pictures.