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AR15.COM
7/31/2010 9:30:06 PM EDT
I received my LEM trigger kit for my USP .45 tactical with the intention of mirroring the LEM/Match hybrid trigger in the Custom Comp. I have retained the safety and am using the Match hammer spring from the stock gun. All directions that I have come across said the only parts needed for this conversion were the Hammer, Cocking Piece, and Cocking Piece Spring.

My question is about the sear - should I use the sear from the LEM kit or the stock sear from the Tactical? I haven't seen any mention of replacing the sear for this conversion, but looking at how the Cocking Piece Spring leg sits on the sear, I figured I'd check with those in the know.

I am currently using the sear from the LEM kit, and the gun is functioning just fine, but I wanted to know which sear is the more appropriate one to use.

Thanks,

~Bill
8/1/2010 7:36:52 AM EDT
[#1]
This is direct from HK:

To convert a USP pistol equipped with a standard DA/SA Match trigger to the Combat Competition (Match LEM) trigger one would need the following parts from a USP/C LEM kit. Not a Match LEM kit.

Hammer-219452
Hammer Axel-214258
Hammer Spring-214695
Cocking Piece-219443
Cocking Piece Spring-219444

Also: The Combat Competition uses TRS # 209266 and Hammer Spring # 215694. Just in case your gun didn't come with a nickel plated sear spring, the Combat Competition uses part # 215691 nickel plated sear spring.


Therefore, to answer your question, you use the sear from the match trigger kit, not the LEM kit.
8/1/2010 10:16:57 AM EDT
[#2]
Thanks Big-Bore, I'll swap the sears back. I assume that's how yours is set up as well? I followed your walk-through USP/C to LEM with safety on HKPro, found it very helpful, thank you for the time you spent on the write up.

~Bill
8/1/2010 12:41:36 PM EDT
[#3]
On the USPC to LEM conversion I used the entire LEM kit sans the TRS, FPBS, and hammer axle.  I only retained the hammer axle so I could retain the safety.  I did use the sear from the LEM kit.  On the full sizes USP Tactical I converted I only used the parts from the LEM kit that HK said I needed to use to convert to the CC match/LEM hybrid, so I did not use the kit sear in that.