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Discussion Starter #1 (Edited)
Hi everyone,

I am trying to install the LEM trigger on my USPC 9mm (KH datecode, 1997 production). What I am trying to achieve here is to make it Lite LEM with working safety. (Lite LEM, V9 or V5)???

I have the HK Pistol LEM Conversion Kit.
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)
https://www.hkparts.net/shop/pc/HK-LEM-Kit-Complete-For-USP-USP-Compact-Pistols-198p316.htm

I also bought the Trigger Return Spring Tool.

I have already took all the parts out of the lower receiver and, just installed the Light trigger return spring. By watching the youtube video and reading the instruction here, I have a few questions for you experienced hk folks here:

1. Do I need to use the new style catch part number 219442? is this the right one?
https://www.hkparts.net/shop/pc/New-Style-Sear-Catch-LEM-Standard-Models-212p1803.htm

2. After I installed the light trigger return spring, does that mean my uspc will be the lite lem? if not, what else do i need to do?

3. Which retent plate should i purchase? is this the right one?
https://www.hkparts.net/shop/pc/Detent-Plate-For-HK45-USP-Variant-5-6-9-10-198p1247.htm

4. Can I use the old safety and Hammer Axle?

5. Do i need to get any other helpful tools?

Thank you very much!
 

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Until TooSixy weighs in and fixes my mistakes:

1. Do I need to use the new style catch part number 219442?
Yes.

Don't know; it's in TooSixy's parts lists. It's the long-nose catch that passes into the recess in the hammer (the old hammer didn't have the recess, and the catch was shorter).

2. After I installed the light trigger return spring, does that mean my uspc will be the lite lem? if not, what else do i need to do?
AFAIK, yes, light LEM.

Is your USPc a V1/V2 (DA/SA)? If so, you can reuse the original detent plate (I did on my USPc 45).

4. Can I use the old safety and Hammer Axle?
Yes. And I believe I used the original control lever on my USPc 45 LEM conversion.

5. Do i need to get any other helpful tools?
A dental pick is handy for lifting up the end of the tiny spring next to the hammer while you insert the sear.

A pin punch is handy to help line up the sear/catch/control lever/disconnector holes while inserting the pin.

If it is your first time reassembling or installing the LEM parts, huge amounts of patience. Know that it will all go back together, eventually, if you keep your cool.

HTH.
 

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1. Yes
2. No. Light TRS is actually heavier than your stock TRS so keep your stock TRS if you want Light LEM.
3. Yes if you don't want the safety lever be pushed down past the F mark (since the decocking function is eliminated when you convert to LEM) then get that V5+6 Detent Plate. If not, keep the stock V1+2 Detent Plate.
4. You have to
5. Patience. Lots of it. :)

Use the longer HS in the LEM kit. The shorter one is for the HK45C only.
 

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Teufelshund Tactical
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Its a very simple process. All you need is a UPS box to put your pistol in and ship to me. I'll get it shipped back to you the next day.
 

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Discussion Starter #6
Until TooSixy weighs in and fixes my mistakes:
2. No. Light TRS is actually heavier than your stock TRS so keep your stock TRS if you want Light LEM.

5. Patience. Lots of it. :)

Use the longer HS in the LEM kit. The shorter one is for the HK45C only.
Thanks guys! I think those are the exact answers that I needed. I will be patient and take my time. When I get all the parts, I will update this post.

Its a very simple process. All you need is a UPS box to put your pistol in and ship to me. I'll get it shipped back to you the next day.
Thanks, james. I have read all the instruction and consider this is something i could learn to do it. I am sure will have fun with this little project. Plus, I need a reason to drink my beer and be away from the wife.
Some local gun smith quot me $200 for the lem kit and installation. I decided to spend $100 on the parts and $100 on the beer.
 

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Teufelshund Tactical
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Thanks, james. I have read all the instruction and consider this is something i could learn to do it. I am sure will have fun with this little project. Plus, I need a reason to drink my beer and be away from the wife.
Some local gun smith quot me $200 for the lem kit and installation. I decided to spend $100 on the parts and $100 on the beer.
I like a man with a plan.
Happy to help, if you get drunk instead.
 

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Discussion Starter #9
You are right. I just put the stock trigger reset spring back on. it is lighter than the light TRS.
 

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Discussion Starter #10
I like a man with a plan.
Happy to help, if you get drunk instead.
You are quite right about my work code. It took me two beers to dissemble the lower parts. And I got stuck at the trigger return spring step. three more beers later, I was like, "ooookay, it looks like budweiser is not going to solve my problem here. I am going to bed and get a tool for that tomorrow."
 

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Discussion Starter #12 (Edited)
Hi guys, I am here to give an update.

I received all he parts this morning and had everything installed in 10 minutes. I knew I could be more efficient when I am not drinking.

It works perfectly ( lite LEM, with safety function still remain ). Basically after I load a round in the chamber the gun is cocked. I also noticed that I can have safety on when I load a round in the chamber. Super! With the safety function I feel more comfortable at the moment. I would need a better holster because the current galco holster I have doesn't cover the thumb safety.

Thank you guys for the help. I learned how to do it and enjoyed every bit of it. LEM tigger is indeed the way to go!


Cost: $110 for the parts, $30 for the beers

Sent from my iPhone using Tapatalk
 

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Discussion Starter #14
I probably will install a night sight on it myself. Are those sights sit on the slide like glock sights? I mean is there any pin on the sights? Can't decide Trijicon or Heinie Straight eight...
 
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