[Eppler]

I ordered another LEM kit for my wife’s USPc 9mm and it had a light spring in the kit so I put in my 45 tactical to check it out and it barely scratched the primmer.
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[TooSixy-closed]

When you say Light LEM spring, I assume you meant Light TRS. If that's the case, your 45 Tactical has a Match trigger (and Match TRS) so why are you replacing the Match TRS with that spring?

 

[Eppler]

Nope it has two hammer springs one long and heavy and one short and very light.

 

[TooSixy-closed]

The long HS is for the USP/USPc/HK45 and the short one is for HK45c only. Being too short to fit the USP, that's why you're getting light strikes.
Again, your Match HS is the lightest HS there is.

 

[Eppler]

I just put in to see what it would do. I like the standard sping for my LEM not too light not too heavy.