for full auto
I bought a USP LEM kit few years ago, it came with this extra spring with no P/N on it. Do anyone know what it's for? Thanks
for full auto
“Please note: That any pre-2005 production USP Variants will also need the new style catch part number 219442.
USP LEM & HK45 trigger pull weights quick guide:
Use the trigger return spring that may be in any newer production HK pistol or HK part # 209266 (black colored, thinner trigger return spring) for light LEM trigger pull, approximately 4-5 lbs.”
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You don't always need the Light TRS if you are converting from a V1 to a LEM. Keep the stock V1 springs. The only time that you'll need the Light TRS (and Light FPBS) is when you are converting from a Heavy LEM --> Light LEM. And you cannot always use the Light FPBS unless yours is a 2005 or later production because the Light FPBS (as pictured in the original post) requires the new-style FP/FPB.
This may be irrelevant, but with THE USP LEM kit which I bought, the "extra" spring(s) were one v2 Heavy TRS and a HK45C hammer spring.
Actually, both hammer springs were unused, as the uspc 45 which I converted has a original uspc ("match") HS, so I removed the Heavy HS and re-installed the original HS.
I had three extra springs. The kit from (yes, HKParts) did not have any FPBS in it. I bought a separate Light FPBS.
I hope I have not confused anyone, including myself.